Sound is produced by vibrations that create variations in air pressure. The human ear detects these variations as sound waves. Sound waves are longitudinal waves that can travel through solids, liquids, and gases via compression and rarefaction. The ear drum vibrates in response to sound waves, and these vibrations are amplified by small bones and converted to nerve impulses that the brain interprets as sound. Properties of sound include pitch, loudness, and timbre. Pitch is determined by frequency, loudness by amplitude, and timbre allows distinguishing between different sound sources.
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SOUND
MUSICAL INSTRUMENT
PROPAGATION OF SOUND
PRODUCTION OF SOUND MUSICAL INSTRUMENTS
SPEED OF A SOUND
WOODWINDS INSTRUMENTS
String INSTRUMENTS
Percussion INSTRUMENTS
Brass INSTRUMENTS
SOUND PRODUCED BY HUMANS
SPEED OF LIGHT V/S SOUND
SOUND PRODUCED BY ANIMAL
VIBRATION & OSCILLATION
LOUDNESS AND PITCH OF SOUND
HUMAN EARS
PERSISTENCE OF HEARING
Echo & REVERBERATION
AUDIBLE AND INAUDIBLE SOUND
NOISE AND MUSICAL SOUND
Noise pollution
HEARING IMPAIRMENT
SIGN LANGUAGE
Reflection of sound
Uses of multiple reflection of sound
SONAR
Anything that moves back and forth makes sound. Moving back and forth is called vibrating. Pluck a guitar string and watch it vibrate back and forth. The vibrations make sound waves.
I made this presentation to support a hearing impaired student in my class. The idea is to talk about what sound is, how we hear and about hearing impairments.
It is a very useful ppt for studying students .I have made with very much hard work it will surely help you. I have made it with an attractive way and do not trust on me ,first see and you sill yourself like it.
SOUND
MUSICAL INSTRUMENT
PROPAGATION OF SOUND
PRODUCTION OF SOUND MUSICAL INSTRUMENTS
SPEED OF A SOUND
WOODWINDS INSTRUMENTS
String INSTRUMENTS
Percussion INSTRUMENTS
Brass INSTRUMENTS
SOUND PRODUCED BY HUMANS
SPEED OF LIGHT V/S SOUND
SOUND PRODUCED BY ANIMAL
VIBRATION & OSCILLATION
LOUDNESS AND PITCH OF SOUND
HUMAN EARS
PERSISTENCE OF HEARING
Echo & REVERBERATION
AUDIBLE AND INAUDIBLE SOUND
NOISE AND MUSICAL SOUND
Noise pollution
HEARING IMPAIRMENT
SIGN LANGUAGE
Reflection of sound
Uses of multiple reflection of sound
SONAR
Anything that moves back and forth makes sound. Moving back and forth is called vibrating. Pluck a guitar string and watch it vibrate back and forth. The vibrations make sound waves.
I made this presentation to support a hearing impaired student in my class. The idea is to talk about what sound is, how we hear and about hearing impairments.
I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget.
Email: parmarshivam105@gmail.com
Chapter - 13, Sound, Science, Class 8
WHAT IS SOUND?
INTRODUCTION TO SOUND
SOUND-PRODUCING MUSICAL INSTRUMENTS
SOUND PROPERTIES
HOW DO HUMANS PRODUCE SOUND?
HOW SOUND PROPAGATE IN A MEDIUM?
SOUNDS BY HUMANS
THERE ARE THREE MAJOR PARTS OF THE HUMAN EAR
AMPLITUDE, TIME PERIOD, AND FREQUENCY
THE LOUDNESS OF A SOUND
PITCH OF THE SOUND
AUDIBLE AND INAUDIBLE SOUNDS
NOISE AND MUSIC
NOISE POLLUTION
CAUSES OF NOISE POLLUTION
EFFECTS OF NOISE POLLUTION
PREVENTION OF NOISE POLLUTION
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur)
The following is a PowerPoint presentation (PPT) created on the chapter Sound, of class 8.
This PPT is useful for getting a full overview of the chapter, and also for making short notes.
I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget.
Email: parmarshivam105@gmail.com
Chapter - 13, Sound, Science, Class 8
WHAT IS SOUND?
INTRODUCTION TO SOUND
SOUND-PRODUCING MUSICAL INSTRUMENTS
SOUND PROPERTIES
HOW DO HUMANS PRODUCE SOUND?
HOW SOUND PROPAGATE IN A MEDIUM?
SOUNDS BY HUMANS
THERE ARE THREE MAJOR PARTS OF THE HUMAN EAR
AMPLITUDE, TIME PERIOD, AND FREQUENCY
THE LOUDNESS OF A SOUND
PITCH OF THE SOUND
AUDIBLE AND INAUDIBLE SOUNDS
NOISE AND MUSIC
NOISE POLLUTION
CAUSES OF NOISE POLLUTION
EFFECTS OF NOISE POLLUTION
PREVENTION OF NOISE POLLUTION
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
By Shivam Parmar (Entrepreneur)
The following is a PowerPoint presentation (PPT) created on the chapter Sound, of class 8.
This PPT is useful for getting a full overview of the chapter, and also for making short notes.
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
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The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
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In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
7. THERE ARE THREE TINY BONES IN HUMAN EARS
[ANVIL,HAMMER AND STIRRUP]
THE NERVE WHICH GOES TO BRAIN FROM EAR
IS AUDITORY NERVE
THE NERVE WHICH CONNECT EAR TO
MOUTH IS EUSTACHIAN NERVE.
11. Propagation of sound
Medium
-Material that sound
waves can travel
through.
-It can travel through
solids, liquids and
gases but not through a
vacuum.
13. Just like all longitudinal
(compression)waves, sound
Waves possess a velocity,
frequency, wavelength,
phase, period, and amplitude.
Sound waves also reflect,
refract, diffract, and interfere.
16. 1. PITCH
-highness or lowness of a
sound.
a. FREQUENCY
-number of sound waves
that passes through a point
in a certain amount of time,
such as one second.
-the greater the frequency,
the higher the pitch.
Hertz (Hz)- unit to measure
frequency and pitch
17. Audio frequency range
-Frequency ranging 20 Hz to 20 000 Hz
-Sounds that human ear can hear is an
example.
INFRASONICS
-Frequency below 20 Hz.
18. 2. LOUDNESS or intensity
-description of how high or
low the sound seems to a
person
-determined mainly by the
amplitude of the sound
wave
a. Decibel (dB)- unit used to
measure sound intensity or
loudness.
19. Sound Loudness (dbs) Hearing
Damage
Average Home 40-50
Loud Music 90-100 After long
exposure
Rock Concert 115-120 Progressive
Jet Engine 120-170 Pain
20. Threshold of
hearing
-sound of the
quietest sound
that can be
heard under
ideal conditions
is 0 dB.
Threshold of
Pain
- Sound level of
120 dB which
can pain and
damage to the
ears.
21. The human ear relates
amplitude to
loudness
and
frequency to
pitch.
22. 3. TIMBRE
-tone color or tone quality
-used to distinguished
between two different
sounds that have the same
pitch and loudness
- It helps to identify what
produced the sound
2 Different waveforms
1. Pure tone- simplest wave
form, it has a soft,
pleasant tone quality
and sinusoidal
2. Complex tone- nearly
sinusoidal
23. A. Speed of Sound
Depends on:
1. Type of medium
-travels better through liquids and
solids and gas
can’t travel through a vacuum.
2. Temperature of medium
-travels faster at higher
temperature.
3. Density
-sound moves well through dense
materials.
4. Elasticity
-sound waves move fast through
elastic materials
24. Doppler Effect
change in wave frequency caused by
a moving wave source
moving toward you -
pitch sounds higher
moving away from you -
pitch sounds lower
25. A. Refraction of sound
-change in direction,
as the wave moves
from one medium to
another
- It bends or refracts
as they move
through air.
27. B. Reflection of sound
Echo- reflected sound
- it is what you
heard shortly
after the original
28. C. Diffraction of Sound
- Sound waves bend or
diffract around
corners or barriers
like doors and walls.
29. 2 types
Constructive interference
-the sound waves arrive at
the same time and phase
Destructive interference
-waves arrive at interval
and are out of phase
30. * Fact *
D. Resonance
- the inducing
of vibrations of a natural
rate by a vibrating source
having the same frequency
31. A. Characteristics of musical sounds
Note- basic element of music
1. Pitch- highness or lowness of
the note
2. Intensity- loudness of the note
3. Rhythm- repeating pattern of
beats and it keeps the time to
the music
4. Melody- series of pitches
5. Harmony- three or more notes
played together.
32. * Fact *
Noise- unwanted sound
and a subtle pollutant
which can threaten the
Health or well being of
an individual.
33. CLASSIFICATION OF INSTRUMENTS
A. Stringed instruments
- Produce a tone when their strings
vibrated.
B. Wind instruments
-contain a column of air that vibrates when
air is blown to the instrument
C. Percussion instruments
-produce sound when they are struck