All about Sound and Light for Grade 7
•Download as PPTX, PDF•
0 likes•405 views
This slide its all about Sound and Light. The characteristics of sound waves, the amplitude, frequency, and a wavelength. And for Lights, I have here a wave theory of light, colors, brightness, intensity. and others.. So, enjoy my slide, I work it for every one.
Report
Share
Report
Share
Recommended
light grade 8.pptx
White light is a mixture of many colors. When white light passes through a prism, it disperses and separates into the visible color spectrum of red, orange, yellow, green, blue, indigo and violet (ROYGBIV). The arrangement of colors from red to violet is due to the different wavelengths of the color light waves, with violet having the highest frequency and energy and red having the lowest frequency and energy.
Properties of light
Light travels in straight lines and very fast, faster than sound. We see objects because they reflect light into our eyes, while shadows are formed when light is blocked. There are two main types of reflection - specular reflection off smooth surfaces like mirrors, and diffuse reflection off rough surfaces. The law of reflection states that the incident ray, reflected ray, and normal to the surface all lie in the same plane, with the angle of incidence equaling the angle of reflection.
Sound (Physics) - Grade 7
This document defines sound and describes how it is produced through vibrations that travel through a medium. It discusses the properties of waves and the different types of waves, including transverse and longitudinal waves. It also covers the speed of sound in different materials, how sound waves are detected by the ear, and how instruments like oscilloscopes can be used to view sound waves. Finally, it discusses the characteristics of loudness, pitch, frequency, and the ranges that human ears can detect.
Characteristics of light
This presentation introduces the characteristics of light and the electromagnetic spectrum. It discusses the different types of electromagnetic waves including their frequencies and wavelengths. It describes the parts of a wave like amplitude, frequency, period, and wavelength. It explains that light travels at a finite speed of 299,792,458 meters per second. It also covers how the brightness of light decreases with the inverse square of the distance from the source.
Sound
1) Sound is produced by vibrations that create longitudinal waves which propagate through a medium and are detected by the human ear. The vibration of matter sets the air molecules in motion which transfers energy.
2) Factors like the thickness, length, and tension of the material producing the vibration determine the pitch and loudness of the sound. A thinner, shorter, or more tense material will produce a higher pitch sound.
3) The outer, middle, and inner ear work together to detect sounds. The outer ear collects sound waves which set the eardrum vibrating, transmitting the vibrations through a series of small bones to the cochlea where they are converted to nerve impulses sent to the
Properties and characteristics of light 4
Light is an electromagnetic wave that travels in straight lines and does not require a medium. It reflects at the same angle it strikes a surface, such as a mirror. Refraction occurs when light passes from one medium to another, such as from air to water, causing the light to bend. The primary colors of light are red, green, and blue, and when combined produce white light. Light travels at 300,000 km/s and has properties of waves like crests, troughs and wavelength. The visible light spectrum ranges from long wavelength red light to short wavelength violet light.
Waves, Light, Sound, Heat
This document contains summaries of 4 lessons:
1. Waves, including wavelength, amplitude, frequency, and types of waves.
2. Sound, including how it is produced, travels, is measured by pitch, intensity, and decibels.
3. Light, including reflection, refraction, absorption, and how materials interact with light.
4. Heat transfer, including temperature, thermal energy, and the processes of conduction, convection, radiation, infrared, heat sources, and energy transfer.
Plane mirror
This document discusses the basics of mirrors and reflection. It explains that a simple mirror is made of a plane glass with a silver coating on the back protected by a layer of red paint. This allows the glass to provide a smooth reflective surface while preventing light from passing through. The key points of reflection are also outlined, including how the incident ray strikes the mirror at the point of incidence, and the reflected ray bounces off at the same angle following the law of reflection.
Recommended
light grade 8.pptx
White light is a mixture of many colors. When white light passes through a prism, it disperses and separates into the visible color spectrum of red, orange, yellow, green, blue, indigo and violet (ROYGBIV). The arrangement of colors from red to violet is due to the different wavelengths of the color light waves, with violet having the highest frequency and energy and red having the lowest frequency and energy.
Properties of light
Light travels in straight lines and very fast, faster than sound. We see objects because they reflect light into our eyes, while shadows are formed when light is blocked. There are two main types of reflection - specular reflection off smooth surfaces like mirrors, and diffuse reflection off rough surfaces. The law of reflection states that the incident ray, reflected ray, and normal to the surface all lie in the same plane, with the angle of incidence equaling the angle of reflection.
Sound (Physics) - Grade 7
This document defines sound and describes how it is produced through vibrations that travel through a medium. It discusses the properties of waves and the different types of waves, including transverse and longitudinal waves. It also covers the speed of sound in different materials, how sound waves are detected by the ear, and how instruments like oscilloscopes can be used to view sound waves. Finally, it discusses the characteristics of loudness, pitch, frequency, and the ranges that human ears can detect.
Characteristics of light
This presentation introduces the characteristics of light and the electromagnetic spectrum. It discusses the different types of electromagnetic waves including their frequencies and wavelengths. It describes the parts of a wave like amplitude, frequency, period, and wavelength. It explains that light travels at a finite speed of 299,792,458 meters per second. It also covers how the brightness of light decreases with the inverse square of the distance from the source.
Sound
1) Sound is produced by vibrations that create longitudinal waves which propagate through a medium and are detected by the human ear. The vibration of matter sets the air molecules in motion which transfers energy.
2) Factors like the thickness, length, and tension of the material producing the vibration determine the pitch and loudness of the sound. A thinner, shorter, or more tense material will produce a higher pitch sound.
3) The outer, middle, and inner ear work together to detect sounds. The outer ear collects sound waves which set the eardrum vibrating, transmitting the vibrations through a series of small bones to the cochlea where they are converted to nerve impulses sent to the
Properties and characteristics of light 4
Light is an electromagnetic wave that travels in straight lines and does not require a medium. It reflects at the same angle it strikes a surface, such as a mirror. Refraction occurs when light passes from one medium to another, such as from air to water, causing the light to bend. The primary colors of light are red, green, and blue, and when combined produce white light. Light travels at 300,000 km/s and has properties of waves like crests, troughs and wavelength. The visible light spectrum ranges from long wavelength red light to short wavelength violet light.
Waves, Light, Sound, Heat
This document contains summaries of 4 lessons:
1. Waves, including wavelength, amplitude, frequency, and types of waves.
2. Sound, including how it is produced, travels, is measured by pitch, intensity, and decibels.
3. Light, including reflection, refraction, absorption, and how materials interact with light.
4. Heat transfer, including temperature, thermal energy, and the processes of conduction, convection, radiation, infrared, heat sources, and energy transfer.
Plane mirror
This document discusses the basics of mirrors and reflection. It explains that a simple mirror is made of a plane glass with a silver coating on the back protected by a layer of red paint. This allows the glass to provide a smooth reflective surface while preventing light from passing through. The key points of reflection are also outlined, including how the incident ray strikes the mirror at the point of incidence, and the reflected ray bounces off at the same angle following the law of reflection.
Light and Color
Light is electromagnetic radiation that can behave as both a particle (photon) and a wave. It travels at 300 million meters per second in a vacuum. When light interacts with matter, it can be transmitted, reflected, scattered, absorbed, or refracted. The color of light depends on its wavelength, with shorter wavelengths like blue having higher frequencies and energies than longer wavelengths like red.
SCIENCE7: Elements and Compounds
This document provides information about elements and compounds. It begins by defining pure substances as either elements or compounds. Elements contain only one type of atom, while compounds contain two or more different types of atoms bonded together. Examples of common elements and their symbols are provided, along with their locations on the periodic table. Elements are also classified as metals, nonmetals, and metalloids. Examples of important compounds like water and their chemical formulas are also given. Students are then asked to classify substances as elements or compounds and answer multiple choice questions to assess their understanding of the key concepts.
Dacota_blue K12: Science 7: Quarter 1: Module 1 matter
This document discusses solutions and related concepts. It begins by defining matter and the different states of matter. It then discusses solutions in depth, including the components of solutions, different types of solutions, factors that affect solubility rates, and ways to express concentration. Examples are provided throughout to illustrate these concepts. Concentration is discussed further, including percentage by weight and by volume. Factors that affect how quickly solutes dissolve are also outlined.
The Star
This document provides an overview of the characteristics, classifications, motions, and significance of stars. It discusses their sizes, colors, temperatures, compositions, and magnitudes. Stars are classified based on their spectral types, which relate to their surface temperatures. The Hertzsprung-Russell diagram plots stars' luminosities and temperatures. Stars exhibit both apparent and actual motions, including proper motion across the sky. Studying stars helps us understand how elements are formed, how our solar system evolved, and the dynamics influencing galaxies.
Light presentation for grade 5
This document provides an overview of key concepts about light for a 5th grade science unit on energy. It defines light as a form of energy that can be seen, and discusses the visible spectrum. It identifies the sun and stars as natural light sources and electrical lamps and candles as artificial sources. The document explains that light travels in straight lines, and how this allows for the formation of shadows and the inverted and minimized images seen through pinhole cameras.
Sound energy
Sound is a form of energy created by vibrations that travel through matter as longitudinal waves. When an object vibrates, it causes the air particles around it to move in a compression and rarefaction pattern that transfers the sound energy. Sound travels through gases, liquids, and solids as a medium and cannot travel through a vacuum. The pitch and loudness of sound depends on the frequency and amplitude of its waves. Musical instruments create sound through vibration of strings, woodwinds, or percussion. The human ear detects sound waves through vibration of the ear drum and small bones, which are translated into nerve signals in the cochlea and perceived as sound by the brain.
Light Properties
Light travels in straight lines at a speed of around 300,000 kilometres per second, much faster than sound. We see objects because they reflect light into our eyes. Shadows are formed when light is blocked by an object. Light reflects off surfaces at the same angle it hits them, following the law of reflection. White light is made up of the colors of the rainbow which can be split and recombined.
Light
The document discusses the nature and properties of light. It explains that early scientists like Newton and Huygens disagreed on whether light behaved as a particle or wave, but Maxwell later proposed light has a dual nature. The document also discusses common light sources like the sun and artificial sources like bulbs. It describes how these sources transform other forms of energy into light. Additionally, it explains properties of light such as traveling in straight lines and casting shadows due to its high fixed speed.
5th grade chapter 14 section 3 - what is light energy
The document discusses properties of electromagnetic radiation including light. It explains that light travels in waves at different speeds in different materials and can be reflected, refracted, or absorbed. Shorter wavelengths like ultraviolet, x-rays, and gamma rays have more energy than longer wavelengths like infrared, microwaves, and radio waves. The document also describes how light travels in straight lines and is bent by lenses, forming shadows and rainbows.
Sound grade 7
Sound is a mechanical wave that requires a medium to travel. It is produced when an object vibrates, exerting a force on the surrounding air or medium. The loudness of a sound is measured in decibels, with louder sounds having higher amplitudes. Sound travels fastest through materials with high density, as the closer molecules can transfer energy more quickly through collisions. The human ear can detect sounds from 20-20,000 Hz but some animals can hear ultrasonic or infrasonic waves outside this range.
Light
This document summarizes key developments in the understanding of light from ancient Greek philosophers to present day. It describes early theories that light consisted of particles (Pythagoras, Newton) or waves (Aristotle, Huygens, Young), experiments measuring the speed of light (Galileo, Roemer, Maxwell), the establishment of light as electromagnetic radiation, and the modern understanding of light exhibiting both wave and particle properties.
Behavior of light
The document discusses various optical phenomena including:
- Reflection - Light bounces off surfaces at the same angle it hits. Smoother surfaces reflect better.
- Refraction - Light bends when passing through different materials, changing speed. This causes dispersion into colors.
- Color - Each color has a different wavelength. Color perceived is the wavelength reflected, others are absorbed.
- Vision - Eyes have rods and cones that detect light and send signals to the brain for color and shape recognition.
- Light sources - Incandescent bulbs heat a filament, fluorescent uses phosphors and gas, neon signs use colored gases, lasers emit synchronized waves.
Light slides
Light is an important source of energy that enables us to see. It travels extremely fast, at 300 million meters per second in a vacuum. When light hits surfaces, it can be reflected, refracted, or dispersed depending on the type of surface. Reflection occurs when light rays bounce off surfaces, while refraction is when light bends as it passes from one medium to another of different density. Dispersion is when white light separates into the colors of the visible spectrum through refraction in a prism.
Characteristic Of light and Visible Spectrum
Light is electromagnetic radiation that stimulates sight and makes objects visible. It is classified based on how it interacts with different materials. Transparent materials allow light to pass through clearly, translucent materials allow some light to pass through, and opaque materials do not allow any light to pass through. The visible light spectrum refers to the portion of the electromagnetic spectrum detectable by the human eye, ranging from infrared to violet. Within this spectrum, colors are arranged from long to short wavelengths as red, orange, yellow, green, blue, and violet.
5th grade chapter 14 section 2 - what is sound energy
Sound is a wave of vibrations that spreads from its source. The vibration is a back-and-forth motion, and sound waves have areas where particles are close together called crests. The number of crests that pass per second is the frequency, with a higher frequency creating a higher pitch. Louder sounds come from sources that vibrate more and have more energy, while loudness can be measured in decibels. Your vocal cords vibrate when talking, caused by air rushing past them, making air particles around them vibrate and travel as sound waves. Sound can travel through solids, liquids and gases but not vacuums, and its speed depends on the material. For sound to be heard, an object
Science of Light
1) Light travels in straight lines and is a form of energy that travels much faster than sound.
2) We see objects because they reflect light into our eyes, and shadows are formed when light is blocked.
3) Mirrors come in plane, convex, and concave shapes and can form real or virtual images depending on their shape and whether the light rays actually meet or appear to meet.
SCIENCE7: Types of Mixtures
This will really help students in knowing Types of Mixtures. It has examples, explanations, exercises and activities.
presentation on light phenomena.pptx
This document is a report submitted by five students at North Western University in Khulna on the topic of light phenomena. It begins with an introduction to light, defining it as an electromagnetic wave made up of oscillating electric and magnetic fields. It then outlines some key properties of light, including that it travels in straight lines, can be reflected, refracted, undergo diffraction and interference, and has both wave-like and particle-like properties. The report further explains the phenomena of reflection, refraction, diffraction, and constructive and destructive interference. It concludes by thanking the reader.
Solution, Solute and Solvent Grade 7
A solution is a mixture of two or more substances, with a solvent dissolving a solute. Water is an example of a common solvent that can dissolve soluble solutes like sugar, salt, and coffee. There are two types of solutes - soluble substances that can dissolve in water, and insoluble substances that cannot dissolve in water and remain as particles, like sand, paper, oil, and rubber. Students are assigned to make a list of at least 10 soluble and 10 insoluble substances found in their house.
Sound
Sound is a form of energy that travels in waves from a vibrating object. It can travel through solids, liquids, and gases in the form of compression waves. The ear detects sound waves and transmits signals to the brain. Properties of sound waves include frequency, wavelength, amplitude, and pitch. The speed of sound depends on the medium and temperature, being fastest in solids and slowest in gases. Reflection and refraction of sound waves results in phenomena like echoes and resonance. Doppler effect changes the perceived frequency of a sound based on the motion of its source.
Sound
This document discusses various topics related to sound waves including:
1. Sound waves are caused by vibration sources like vibrating guitar strings or air inside a trumpet. Sound waves are longitudinal waves that cause compressions and rarefactions in the transmitting medium like air.
2. The approximate range of audible frequencies for humans is 20 Hz to 20,000 Hz. Ultrasound has frequencies above this range and is used in medical diagnosis.
3. A medium is required to transmit sound waves as compressions and rarefactions can only form if the medium can be compressed and stretched. Sound cannot propagate through a vacuum.
The summary covers the key topics and main points discussed in the document in 3 sentences
Properties of Waves.pptx
OBJECTIVES:
As you go through this chapter, you will able to:
• Define the properties of waves.
• Classify the types and characteristics of waves.
More Related Content
What's hot
Light and Color
Light is electromagnetic radiation that can behave as both a particle (photon) and a wave. It travels at 300 million meters per second in a vacuum. When light interacts with matter, it can be transmitted, reflected, scattered, absorbed, or refracted. The color of light depends on its wavelength, with shorter wavelengths like blue having higher frequencies and energies than longer wavelengths like red.
SCIENCE7: Elements and Compounds
This document provides information about elements and compounds. It begins by defining pure substances as either elements or compounds. Elements contain only one type of atom, while compounds contain two or more different types of atoms bonded together. Examples of common elements and their symbols are provided, along with their locations on the periodic table. Elements are also classified as metals, nonmetals, and metalloids. Examples of important compounds like water and their chemical formulas are also given. Students are then asked to classify substances as elements or compounds and answer multiple choice questions to assess their understanding of the key concepts.
Dacota_blue K12: Science 7: Quarter 1: Module 1 matter
This document discusses solutions and related concepts. It begins by defining matter and the different states of matter. It then discusses solutions in depth, including the components of solutions, different types of solutions, factors that affect solubility rates, and ways to express concentration. Examples are provided throughout to illustrate these concepts. Concentration is discussed further, including percentage by weight and by volume. Factors that affect how quickly solutes dissolve are also outlined.
The Star
This document provides an overview of the characteristics, classifications, motions, and significance of stars. It discusses their sizes, colors, temperatures, compositions, and magnitudes. Stars are classified based on their spectral types, which relate to their surface temperatures. The Hertzsprung-Russell diagram plots stars' luminosities and temperatures. Stars exhibit both apparent and actual motions, including proper motion across the sky. Studying stars helps us understand how elements are formed, how our solar system evolved, and the dynamics influencing galaxies.
Light presentation for grade 5
This document provides an overview of key concepts about light for a 5th grade science unit on energy. It defines light as a form of energy that can be seen, and discusses the visible spectrum. It identifies the sun and stars as natural light sources and electrical lamps and candles as artificial sources. The document explains that light travels in straight lines, and how this allows for the formation of shadows and the inverted and minimized images seen through pinhole cameras.
Sound energy
Sound is a form of energy created by vibrations that travel through matter as longitudinal waves. When an object vibrates, it causes the air particles around it to move in a compression and rarefaction pattern that transfers the sound energy. Sound travels through gases, liquids, and solids as a medium and cannot travel through a vacuum. The pitch and loudness of sound depends on the frequency and amplitude of its waves. Musical instruments create sound through vibration of strings, woodwinds, or percussion. The human ear detects sound waves through vibration of the ear drum and small bones, which are translated into nerve signals in the cochlea and perceived as sound by the brain.
Light Properties
Light travels in straight lines at a speed of around 300,000 kilometres per second, much faster than sound. We see objects because they reflect light into our eyes. Shadows are formed when light is blocked by an object. Light reflects off surfaces at the same angle it hits them, following the law of reflection. White light is made up of the colors of the rainbow which can be split and recombined.
Light
The document discusses the nature and properties of light. It explains that early scientists like Newton and Huygens disagreed on whether light behaved as a particle or wave, but Maxwell later proposed light has a dual nature. The document also discusses common light sources like the sun and artificial sources like bulbs. It describes how these sources transform other forms of energy into light. Additionally, it explains properties of light such as traveling in straight lines and casting shadows due to its high fixed speed.
5th grade chapter 14 section 3 - what is light energy
The document discusses properties of electromagnetic radiation including light. It explains that light travels in waves at different speeds in different materials and can be reflected, refracted, or absorbed. Shorter wavelengths like ultraviolet, x-rays, and gamma rays have more energy than longer wavelengths like infrared, microwaves, and radio waves. The document also describes how light travels in straight lines and is bent by lenses, forming shadows and rainbows.
Sound grade 7
Sound is a mechanical wave that requires a medium to travel. It is produced when an object vibrates, exerting a force on the surrounding air or medium. The loudness of a sound is measured in decibels, with louder sounds having higher amplitudes. Sound travels fastest through materials with high density, as the closer molecules can transfer energy more quickly through collisions. The human ear can detect sounds from 20-20,000 Hz but some animals can hear ultrasonic or infrasonic waves outside this range.
Light
This document summarizes key developments in the understanding of light from ancient Greek philosophers to present day. It describes early theories that light consisted of particles (Pythagoras, Newton) or waves (Aristotle, Huygens, Young), experiments measuring the speed of light (Galileo, Roemer, Maxwell), the establishment of light as electromagnetic radiation, and the modern understanding of light exhibiting both wave and particle properties.
Behavior of light
The document discusses various optical phenomena including:
- Reflection - Light bounces off surfaces at the same angle it hits. Smoother surfaces reflect better.
- Refraction - Light bends when passing through different materials, changing speed. This causes dispersion into colors.
- Color - Each color has a different wavelength. Color perceived is the wavelength reflected, others are absorbed.
- Vision - Eyes have rods and cones that detect light and send signals to the brain for color and shape recognition.
- Light sources - Incandescent bulbs heat a filament, fluorescent uses phosphors and gas, neon signs use colored gases, lasers emit synchronized waves.
Light slides
Light is an important source of energy that enables us to see. It travels extremely fast, at 300 million meters per second in a vacuum. When light hits surfaces, it can be reflected, refracted, or dispersed depending on the type of surface. Reflection occurs when light rays bounce off surfaces, while refraction is when light bends as it passes from one medium to another of different density. Dispersion is when white light separates into the colors of the visible spectrum through refraction in a prism.
Characteristic Of light and Visible Spectrum
Light is electromagnetic radiation that stimulates sight and makes objects visible. It is classified based on how it interacts with different materials. Transparent materials allow light to pass through clearly, translucent materials allow some light to pass through, and opaque materials do not allow any light to pass through. The visible light spectrum refers to the portion of the electromagnetic spectrum detectable by the human eye, ranging from infrared to violet. Within this spectrum, colors are arranged from long to short wavelengths as red, orange, yellow, green, blue, and violet.
5th grade chapter 14 section 2 - what is sound energy
Sound is a wave of vibrations that spreads from its source. The vibration is a back-and-forth motion, and sound waves have areas where particles are close together called crests. The number of crests that pass per second is the frequency, with a higher frequency creating a higher pitch. Louder sounds come from sources that vibrate more and have more energy, while loudness can be measured in decibels. Your vocal cords vibrate when talking, caused by air rushing past them, making air particles around them vibrate and travel as sound waves. Sound can travel through solids, liquids and gases but not vacuums, and its speed depends on the material. For sound to be heard, an object
Science of Light
1) Light travels in straight lines and is a form of energy that travels much faster than sound.
2) We see objects because they reflect light into our eyes, and shadows are formed when light is blocked.
3) Mirrors come in plane, convex, and concave shapes and can form real or virtual images depending on their shape and whether the light rays actually meet or appear to meet.
SCIENCE7: Types of Mixtures
This will really help students in knowing Types of Mixtures. It has examples, explanations, exercises and activities.
presentation on light phenomena.pptx
This document is a report submitted by five students at North Western University in Khulna on the topic of light phenomena. It begins with an introduction to light, defining it as an electromagnetic wave made up of oscillating electric and magnetic fields. It then outlines some key properties of light, including that it travels in straight lines, can be reflected, refracted, undergo diffraction and interference, and has both wave-like and particle-like properties. The report further explains the phenomena of reflection, refraction, diffraction, and constructive and destructive interference. It concludes by thanking the reader.
Solution, Solute and Solvent Grade 7
A solution is a mixture of two or more substances, with a solvent dissolving a solute. Water is an example of a common solvent that can dissolve soluble solutes like sugar, salt, and coffee. There are two types of solutes - soluble substances that can dissolve in water, and insoluble substances that cannot dissolve in water and remain as particles, like sand, paper, oil, and rubber. Students are assigned to make a list of at least 10 soluble and 10 insoluble substances found in their house.
Sound
Sound is a form of energy that travels in waves from a vibrating object. It can travel through solids, liquids, and gases in the form of compression waves. The ear detects sound waves and transmits signals to the brain. Properties of sound waves include frequency, wavelength, amplitude, and pitch. The speed of sound depends on the medium and temperature, being fastest in solids and slowest in gases. Reflection and refraction of sound waves results in phenomena like echoes and resonance. Doppler effect changes the perceived frequency of a sound based on the motion of its source.
What's hot (20)
Dacota_blue K12: Science 7: Quarter 1: Module 1 matter
Dacota_blue K12: Science 7: Quarter 1: Module 1 matter
5th grade chapter 14 section 3 - what is light energy
5th grade chapter 14 section 3 - what is light energy
5th grade chapter 14 section 2 - what is sound energy
5th grade chapter 14 section 2 - what is sound energy
Similar to All about Sound and Light for Grade 7
Sound
This document discusses various topics related to sound waves including:
1. Sound waves are caused by vibration sources like vibrating guitar strings or air inside a trumpet. Sound waves are longitudinal waves that cause compressions and rarefactions in the transmitting medium like air.
2. The approximate range of audible frequencies for humans is 20 Hz to 20,000 Hz. Ultrasound has frequencies above this range and is used in medical diagnosis.
3. A medium is required to transmit sound waves as compressions and rarefactions can only form if the medium can be compressed and stretched. Sound cannot propagate through a vacuum.
The summary covers the key topics and main points discussed in the document in 3 sentences
Properties of Waves.pptx
OBJECTIVES:
As you go through this chapter, you will able to:
• Define the properties of waves.
• Classify the types and characteristics of waves.
SOUND
Sound is produced by vibration of objects. Vibrations cause compressions and rarefactions in the medium through which sound travels, such as air. These compressions and rarefactions form longitudinal waves that propagate through the medium. The speed, frequency, wavelength, and amplitude characterize sound waves. Humans can hear sounds between 20 Hz and 20,000 Hz. Ultrasound above this range and infrasound below it are used for applications like medical imaging, cleaning, and animal communication.
ENERGY Science 7 hhhhhhhhhhhhhhhhhhjjjjj
This document provides a summary of key concepts related to sound energy, including:
- Sound is produced by vibrations traveling through a medium in the form of longitudinal waves. The human voice box or larynx produces sounds when vocal cords vibrate.
- Sound waves can travel through solids, liquids, and gases by causing the particles in these mediums to vibrate. Sound cannot travel through a vacuum.
- The human ear can detect sounds between 20-20,000 Hz. Characteristics of sound include loudness, pitch, and quality. Musical sounds are generally pleasant while noise is unpleasant.
- Light is a form of electromagnetic radiation that travels in waves. Theories have described light as particles
PHYSICAL SCIENCE OF QUARTER 2 WEEK 4.pptx
The document describes various characteristics and properties of waves, including:
1. Crests and troughs define the highest and lowest points of a wave, with the distance between crests or troughs defining the wavelength. Amplitude is the maximum displacement from the equilibrium position.
2. Shorter wavelengths correspond to higher energy waves, while longer wavelengths are lower energy.
3. Early attempts to measure the speed of light by Galileo and Roemer were unsuccessful or yielded finite but inaccurate values, until Roemer used observations of Jupiter's moon Io to estimate the speed of light at 2.25 x 10^8 m/s.
4. The nature of light was debated as either waves or
Sound
Sound waves are produced by the vibration of molecules and transmitted through matter as longitudinal waves, traveling faster in solids than liquids or gases due to the closer proximity of molecules. Sound travels as waves that can be reflected, refracted, or absorbed by various media; the velocity depends on the density and elasticity of the material. The human ear detects sound waves through the vibration of the eardrum and conversion to neural signals by specialized structures in the inner ear that are transmitted to the brain for interpretation.
materi kelas 8 Sound
Sound is produced by vibration and requires a medium to travel through. The document discusses the definition of sound, the speed of sound in different mediums, experiments measuring the speed of sound, factors affecting sound like frequency and amplitude, resonance, and reflection of sound. It provides examples and formulas for calculating speed of sound based on distance and time, using the relationship speed = distance/time. Human hearing is limited to sounds between 20-20,000 Hz.
Physics copy-120407040751-phpapp01
- A wave is a repeating disturbance that transfers energy through matter or space by causing particles to vibrate and bump into nearby particles, transferring the energy (first 3 sentences).
- Sound is a form of energy caused by vibrations that transfers through longitudinal waves, affecting particle pressure. It can be reflected, refracted, absorbed, and exhibits interference and diffraction (next 3 sentences).
- The speed of sound depends on the medium and temperature, and the Doppler effect occurs when the frequency changes due to a moving source (last 2 sentences).
1sound
Sound is produced by vibration and needs a medium to travel through. When an object vibrates, it causes disturbances in the surrounding medium that propagate as a mechanical wave. In air, these disturbances consist of alternating regions of high and low pressure called compressions and rarefactions. Sound waves are longitudinal waves that cause particles in the medium to vibrate back and forth parallel to the direction of propagation. The human ear detects sound waves and converts them into electrical signals that are sent to the brain for interpretation.
Sound
This document discusses key concepts about the nature and properties of sound. It defines sound as a mechanical wave that is created by vibrating objects and propagates through a medium by particle vibration. The document covers topics like: the generation and propagation of sound waves; amplitude and frequency; speed of sound in different mediums; and the Doppler effect. It provides examples of the range of hearing for different animals and defines concepts such as intensity, wavelength, reflection, refraction, and interference of sound waves.
Waves&sound
This document discusses different types of waves including water waves, sound waves, and seismic waves. It defines a wave as a disturbance that transfers energy through space and matter. There are two main types of waves: transverse waves where the vibration is perpendicular to the direction of travel, and longitudinal waves where the vibration is parallel. Sound is described as a longitudinal wave that requires a medium like air, water or solid to transmit vibrations. Key sound wave properties like frequency, wavelength, amplitude and speed are also defined.
Sund
Sound is produced by vibration and needs a medium to travel through. It propagates as longitudinal waves of alternating compressions and rarefactions. The human range of hearing is between 20 Hz to 20 kHz. Ultrasound above this range has many applications like cleaning, object detection and medical imaging. Sonar uses ultrasound to detect underwater objects by calculating the time taken for echo reception. The human ear collects sound via the outer ear and transmits it through the middle ear bones to the inner ear where it is converted to electrical signals for the brain to interpret as sound.
SOUND
Sound is produced by vibration and needs a medium to travel through. It propagates as longitudinal waves of alternating compressions and rarefactions. The human range of hearing is between 20 Hz to 20 kHz. Ultrasound above this range has many applications like cleaning, object detection and medical imaging. Sonar uses ultrasound to detect underwater objects by calculating the time taken for echoes to return. The human ear collects sound via the outer ear and transmits it through the middle ear bones to the inner ear where it is converted to electrical signals for the brain to interpret as sound.
CLASS 9 _ SOUND.pptx
Sound is produced due to vibration and needs a medium to travel. It propagates as longitudinal waves of alternating compressions and rarefactions. The characteristics of a sound wave include its frequency, wavelength, amplitude and speed. Sound can be reflected, refracted and undergoes echo and reverberation. Ultrasound has many applications. Sonar uses ultrasound to detect underwater objects. The human ear collects sound waves and converts them into electrical signals through a series of structures to be interpreted by the brain.
ch 12 sound.pdf
1. The document discusses Heinrich Hertz's experiments with sound and how it is produced through vibration and propagates as longitudinal waves through a medium like air.
2. Key experiments shown include using a vibrating tuning fork to produce compressions and rarefactions in air, demonstrating that sound needs a material medium to travel, and that the speed of sound depends on the medium and temperature.
3. Applications of sound reflection, resonance, infrasound, ultrasound, and SONAR are also summarized.
Arpit meena
The document discusses the production, propagation, and perception of sound. It explains that sound is produced by vibration and travels as a longitudinal wave through a medium by causing regions of high and low pressure called compressions and rarefactions. The human ear collects sound waves through the outer, middle, and inner ear which converts the vibrations into electrical signals for the brain to interpret as sound.
chapter sound for class 9 ppt
https://oncehelp.com/ref/arpitkantya62 --------earn money by share a youtube video....
chapter sound for class 9 ppt
sound class 9 physics
Heinrich Hertz's document discusses sound, including its production, propagation through a medium like air, and characteristics as a mechanical wave. It describes experiments showing sound's reflection, reverberation, and need for a medium using a bell jar. The document also covers infrasonic and ultrasonic sounds, uses of ultrasound like SONAR, and the range of human hearing.
Lect. 1.ppt
This document provides an introduction to ultrasound, including its history, industrial and medical applications, and the fundamental physics concepts. It describes how ultrasound was first discovered through the piezoelectric effect in 1880. Early applications included attempts to locate the Titanic and development of sonar during WWII. The first medical ultrasound unit was created in 1937 to image the brain, and ultrasound imaging has since advanced to replace water baths with mineral oil coupling and display real-time images. The document also covers wave properties, production of ultrasound waves using piezoelectric transducers, and the sound spectrum including infrasound, audible sound, and ultrasound frequencies.
5sound-181206142548.pd
This document discusses sound and its properties. It describes how sound is produced through vibration and how it needs a medium like air, water or solid material to travel. Key points covered include the propagation of sound waves, their characteristics like wavelength and frequency, reflection of sound, and uses of both audible and ultrasonic sound including in SONAR systems.
Similar to All about Sound and Light for Grade 7 (20)
Recently uploaded
Summary Of transcription and Translation.pdf
Hello Everyone Here We are Sharing You with The process of protien Synthesis in very short points you will be Able to understand It Very well
Direct Seeded Rice - Climate Smart Agriculture
Direct Seeded Rice - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
快速办理(UAM毕业证书)马德里自治大学毕业证学位证一模一样
学校原件一模一样【微信：741003700 】《(UAM毕业证书)马德里自治大学毕业证学位证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
SDSS1335+0728: The awakening of a ∼ 106M⊙ black hole⋆
Context. The early-type galaxy SDSS J133519.91+072807.4 (hereafter SDSS1335+0728), which had exhibited no prior optical variations during the preceding two decades, began showing significant nuclear variability in the Zwicky Transient Facility (ZTF) alert stream from December 2019 (as ZTF19acnskyy). This variability behaviour, coupled with the host-galaxy properties, suggests that SDSS1335+0728 hosts a ∼ 106M⊙ black hole (BH) that is currently in the process of ‘turning on’. Aims. We present a multi-wavelength photometric analysis and spectroscopic follow-up performed with the aim of better understanding the origin of the nuclear variations detected in SDSS1335+0728. Methods. We used archival photometry (from WISE, 2MASS, SDSS, GALEX, eROSITA) and spectroscopic data (from SDSS and LAMOST) to study the state of SDSS1335+0728 prior to December 2019, and new observations from Swift, SOAR/Goodman, VLT/X-shooter, and Keck/LRIS taken after its turn-on to characterise its current state. We analysed the variability of SDSS1335+0728 in the X-ray/UV/optical/mid-infrared range, modelled its spectral energy distribution prior to and after December 2019, and studied the evolution of its UV/optical spectra. Results. From our multi-wavelength photometric analysis, we find that: (a) since 2021, the UV flux (from Swift/UVOT observations) is four times brighter than the flux reported by GALEX in 2004; (b) since June 2022, the mid-infrared flux has risen more than two times, and the W1−W2 WISE colour has become redder; and (c) since February 2024, the source has begun showing X-ray emission. From our spectroscopic follow-up, we see that (i) the narrow emission line ratios are now consistent with a more energetic ionising continuum; (ii) broad emission lines are not detected; and (iii) the [OIII] line increased its flux ∼ 3.6 years after the first ZTF alert, which implies a relatively compact narrow-line-emitting region. Conclusions. We conclude that the variations observed in SDSS1335+0728 could be either explained by a ∼ 106M⊙ AGN that is just turning on or by an exotic tidal disruption event (TDE). If the former is true, SDSS1335+0728 is one of the strongest cases of an AGNobserved in the process of activating. If the latter were found to be the case, it would correspond to the longest and faintest TDE ever observed (or another class of still unknown nuclear transient). Future observations of SDSS1335+0728 are crucial to further understand its behaviour. Key words. galaxies: active– accretion, accretion discs– galaxies: individual: SDSS J133519.91+072807.4
Sustainable Land Management - Climate Smart Agriculture
Sustainable Land Management - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Sustainable Land Management presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Mechanisms and Applications of Antiviral Neutralizing Antibodies - Creative B...
Neutralizing antibodies, pivotal in immune defense, specifically bind and inhibit viral pathogens, thereby playing a crucial role in protecting against and mitigating infectious diseases. In this slide, we will introduce what antibodies and neutralizing antibodies are, the production and regulation of neutralizing antibodies, their mechanisms of action, classification and applications, as well as the challenges they face.
Gadgets for management of stored product pests_Dr.UPR.pdf
Insectsplayamajorroleinthedeteriorationoffoodgrainscausingbothquantitativeandqualitativelosses
Wellprovedthatnogranariescanbefilledwithgrainswithoutinsectsastheharvestedproducecontainegg(or)larvae(or)pupae(or)adultinsectinthembecauseoffieldcarryoverinfestationwhichcannotbeavoidedindevelopingcountrieslikeIndia
Simpletechnologiesfortimelydetectionofinsectsinthestoredproduceandtherebyplantimelycontrolmeasures
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
Male reproduction physiology by Suyash Garg .pptx
Physiology of Male reproduction.
Video mentioned at page no. 23 as summary for better understanding
Immersive Learning That Works: Research Grounding and Paths Forward
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdf
Ozturkcan, S., Berndt, A., & Angelakis, A. (2024). Mending clothing to support sustainable fashion. Presented at the 31st Annual Conference by the Consortium for International Marketing Research (CIMaR), 10-13 Jun 2024, University of Gävle, Sweden.
Discovery of An Apparent Red, High-Velocity Type Ia Supernova at 𝐳 = 2.9 wi...
We present the JWST discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS
+
53.13485
−
27.82088
with a host spectroscopic redshift of
2.903
±
0.007
. The transient was identified in deep James Webb Space Telescope (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectroscopic followup with NIRCam and NIRSpec, respectively, confirm the redshift and yield UV-NIR light-curve, NIR color, and spectroscopic information all consistent with a Type Ia classification. Despite its classification as a likely SN Ia, SN 2023adsy is both fairly red (
�
(
�
−
�
)
∼
0.9
) despite a host galaxy with low-extinction and has a high Ca II velocity (
19
,
000
±
2
,
000
km/s) compared to the general population of SNe Ia. While these characteristics are consistent with some Ca-rich SNe Ia, particularly SN 2016hnk, SN 2023adsy is intrinsically brighter than the low-
�
Ca-rich population. Although such an object is too red for any low-
�
cosmological sample, we apply a fiducial standardization approach to SN 2023adsy and find that the SN 2023adsy luminosity distance measurement is in excellent agreement (
≲
1
�
) with
Λ
CDM. Therefore unlike low-
�
Ca-rich SNe Ia, SN 2023adsy is standardizable and gives no indication that SN Ia standardized luminosities change significantly with redshift. A larger sample of distant SNe Ia is required to determine if SN Ia population characteristics at high-
�
truly diverge from their low-
�
counterparts, and to confirm that standardized luminosities nevertheless remain constant with redshift.
Recently uploaded (20)
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
SDSS1335+0728: The awakening of a ∼ 106M⊙ black hole⋆
SDSS1335+0728: The awakening of a ∼ 106M⊙ black hole⋆
Sustainable Land Management - Climate Smart Agriculture
Sustainable Land Management - Climate Smart Agriculture
Mechanisms and Applications of Antiviral Neutralizing Antibodies - Creative B...
Mechanisms and Applications of Antiviral Neutralizing Antibodies - Creative B...
GBSN - Biochemistry (Unit 6) Chemistry of Proteins
GBSN - Biochemistry (Unit 6) Chemistry of Proteins
Gadgets for management of stored product pests_Dr.UPR.pdf
Gadgets for management of stored product pests_Dr.UPR.pdf
Microbiology of Central Nervous System INFECTIONS.pdf
Microbiology of Central Nervous System INFECTIONS.pdf
Immersive Learning That Works: Research Grounding and Paths Forward
Immersive Learning That Works: Research Grounding and Paths Forward
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdf
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdf
Discovery of An Apparent Red, High-Velocity Type Ia Supernova at 𝐳 = 2.9 wi...
Discovery of An Apparent Red, High-Velocity Type Ia Supernova at 𝐳 = 2.9 wi...
All about Sound and Light for Grade 7
- 3. P I T C H
- 4. L I G H T
- 5. C O L O R
- 6. S O U N D
- 8. Sound Waves • are longitudinal waves created from a vibrating source. • They require a medium (Solid, liquid, or gas) to transfer energy.
- 9. Sound cannot be heard in outer space because outer space is a vacuum with no solids, liquids, or gases.
- 10. CHARACTERISTICS OF SOUND WAVES Physical Quantities: • AMPLITUDE • FREQUENCY • WAVELENGTH
- 11. PITCH and FREQUENCY • Pitch is determined by frequency • “The higher the frequency of the sound, the higher the pitch produce.” • Examples: (Sound made by a Violin or Piccolo)
- 13. SOUND FREQUENCY RANGES OF HUMAN AND DIFFERENT ANIMALS
- 14. Beluga Whale
- 15. Audible Range human beings can respond to frequencies from 20Hz to 20,000Hz.
- 16. Ultrasonic -sound waves that have frequencies above 20,000Hz. examples: (dog, bat) Infrasonic -sound waves whose frequencies are below 20Hz. examples: ( earthquake, volcanoes)
- 18. LOUDNESS and AMPLITUDE • Loudness is determined by the amplitude of the sound waves • “A larger amplitude caused by a more energetic vibration produces a sound. Also amplitude is related to sound intensity.”
- 19. Decibel (dB) is the unit used to measure loudness.
- 20. QUALITY and WAVE FORM To distinguish between two different sounds that have the same pitch and loudness, timbre or tone quality is used.
- 22. How does the human voice box work? In medical terms, the human voice box is known as the larynx. You can feel your larynx vibrating if you place your hand on your throat and hum.
- 24. Light • Is light a particle or a wave? Based on many investigations, light is now considered to have dual characteristics. Light sometimes behavior as a wave, and sometimes as a particle.
- 25. Light as a Particle According to Sir Isaac Newton, who proposed the corpuscular theory, light is made up of streams of particles, and shadow formation is an evidence of this.
- 26. TWO REGION: 1. Darker Region, (full shadow) UMBRA 2. Lighter Region, (partial shadow) PENUMBRA
- 27. Solar Eclipse occurs when the moon casts its shadow on Earth Lunar Eclipse happens when Earth casts its shadow on the moon.
- 30. Light as a Wave Wave theory of Light – first proposed by Christian Huygens who rejected Newton’s idea.
- 31. The difference between light as a particle, and light as a wave.
- 33. Two Properties of Light in terms of the Wave theory: Intensity (brightness), and color.
- 34. The Brightness of Light The science of measuring the intensity or brightness of light is called photometry.
- 36. Light comes from natural and artificial sources. • Luminous objects examples:Sun, stars - give off light of their own
- 37. The brightness of light that these objects produce is known a Luminous Intensity. Luminous Intensity – measure in terms of candela (cd).
- 39. On the other hand, the moon and the other things that reflect light from other sources are called Nonluminous objects. The amount of illumination they receive is called iluminance.
- 40. Color Visible Light – which travels at a speed of 3.00x10 m/s, falls in the wavelength range of about 400nm to 750nm. This range is known as the visible spectrum, and within it lie the different colors from violet to red. 8
- 41. If light has a wavelength shorter than 400nm, it is called Ultraviolet light (UV), but if it has a wavelength greater than 750nm, it is called infrared light (IR).
- 43. • When light passes through the prism through a phenomenon called dispersion, the light spreads out into bands of color, called spectrum. • A prism separates white light into the colors of the rainbow – (ROYGBIV).
- 46. A. Write the letter of the correct answer. 1. Frequencies that is audible to human a. below 20Hz b. from 20Hz to 20,000Hz c. above 20,000Hz d. all of the above
- 47. 2. What is the voice box of the human? a. lungs b. larynx c. mouth d. esophagus
- 48. 3. It is used to measure loudness. a. decibels b. photometry c. meter stick d. ruler
- 49. 4. Which color of the visible light spectrum has the lowest frequency? a. Red b. Blue c. Green d. Violet
- 50. 5. He proposed the corpuscular theory. a. Galileo b. Isaac Newton c. Christian Huygens d. Albert Einstein
- 51. 6. What objects that do not give off their own light? a. luminous b. nonluminous c. luminescent d. none of the above
- 52. 7. It refers to a longitudinal waves created from a vibrating source. a. Sound waves b. loudness c. frequency d. none of the above
- 53. 8. These are the examples of ultrasonic except. a. bat b. dog c. earthquake d. mouse
- 54. 9. It is a science of measuring the intensity or brightness of light. a. Tape measure b. Photometry c. Thermometer d. Ruler
- 55. 10. It occurs when the moon casts its shadow on Earth. a. Lunar Eclipse b. Moon Eclipse c. Solar Eclipse d. Sun Eclipse
- 56. B. Write T if the statement is true, and F if otherwise. 1. Sound cannot be heard in outer space because outer space is a vacuum with no solids, liquids, or gases.
- 57. 2. In Pitch and frequency, “The higher the frequency of the sound, the lower the pitch produce.” 3. To distinguish between two different sounds that have the same pitch and loudness, we use timbre or tone quality.
- 58. 4. a wavelength greater than 750nm, it is called infrared light (IR). 5. The Sun, Star are the examples of nonluminous objects.
- 59. Assignment: Research and define the following words. 1. Heat 2. Electricity 3. Temperature 4. Thermal Energy 5. Conduction 6. Convection 7. Radiation