Sound is produced by vibrating objects and needs a medium like air or water to travel. In humans, sound is produced when air vibrates the vocal cords in the larynx. We hear sound when vibrations reach the eardrum, causing it to vibrate and send signals to the brain. The amplitude of vibration determines loudness, while frequency determines pitch. Noise pollution refers to excessive unwanted sound that can harm health, while music is pleasing sound. Measures to reduce noise pollution include controlling sources, installing silencing devices, and planting trees.
Complete and comprehensive study of the entire chapter with attractive pictorial representation of topic being discussed and Studied. Ideal material for students to get a gist of the entire Chapter, make projects, complete ppt slide presentation for self study and group discussion.
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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)
Complete and comprehensive study of the entire chapter with attractive pictorial representation of topic being discussed and Studied. Ideal material for students to get a gist of the entire Chapter, make projects, complete ppt slide presentation for self study and group discussion.
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.
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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)
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
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.
a ppt on sound
includes- what is sound
production of sound
propagation of sound
characteristics of sound
reflection of sound
applications of reflection of sound
range of frequencies
ultrasound and its 8 usages
hope it helpful :D
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
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.
a ppt on sound
includes- what is sound
production of sound
propagation of sound
characteristics of sound
reflection of sound
applications of reflection of sound
range of frequencies
ultrasound and its 8 usages
hope it helpful :D
Assignment of Business Law : Environment pollution caused by Plastic, a study...Abdulla chowdhury
In Bangladesh People have knowledge regarding environmental pollution caused by plastic, but most of them are not bothering because of social practice, lacking of systems and poor respect for the law.
this is a notes of sound for class 8 students. this will help you to revise the chapter very quickly. recap is also included in this.
with the help of pictures you will be able to understand it quickly.
Sound by gaurav Sound by gaurav Sound by gaurav ghankhedeSound by Sound by gaurav Sound by gaurav ghankhede Sound by gaurav Sound by gaurav Sound by gaurav ghankhedeSound by gaurav ghankhede
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.
The following power point presentation discusses about sound, how its produced and how the sound travels. We also discuss how we are able to listen using our ears. Thereafter we discuss in brief about the properties of sound, We also discuss about various musical instruments. Lastly we discuss about noise pollution and how we can control it
This report gives a detailed analysis on the financial position and assessment on one of the leading transportation service conglomorate in India, VRL Logistics.
[Note: This is a partial preview. To download this presentation, visit:
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Sustainability has become an increasingly critical topic as the world recognizes the need to protect our planet and its resources for future generations. Sustainability means meeting our current needs without compromising the ability of future generations to meet theirs. It involves long-term planning and consideration of the consequences of our actions. The goal is to create strategies that ensure the long-term viability of People, Planet, and Profit.
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1. Introduction and Key Concepts of Sustainability
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4. Sustainability Implementation & Best Practices
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Enterprise Excellence is Inclusive Excellence.pdfKaiNexus
Enterprise excellence and inclusive excellence are closely linked, and real-world challenges have shown that both are essential to the success of any organization. To achieve enterprise excellence, organizations must focus on improving their operations and processes while creating an inclusive environment that engages everyone. In this interactive session, the facilitator will highlight commonly established business practices and how they limit our ability to engage everyone every day. More importantly, though, participants will likely gain increased awareness of what we can do differently to maximize enterprise excellence through deliberate inclusion.
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A way to engage all in creating Inclusive Excellence. Lessons from the US military and their parallels to the story of Harry Potter. How belt systems and CI teams can destroy inclusive practices. How leadership language invites people to the party. There are three things leaders can do to engage everyone every day: maximizing psychological safety to create environments where folks learn, contribute, and challenge the status quo.
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Dr. William Harvey is a seasoned Operations Leader with extensive experience in chemical processing, manufacturing, and operations management. At Michelman, he currently oversees multiple sites, leading teams in strategic planning and coaching/practicing continuous improvement. William is set to start his eighth year of teaching at the University of Cincinnati where he teaches marketing, finance, and management. William holds various certifications in change management, quality, leadership, operational excellence, team building, and DiSC, among others.
India Orthopedic Devices Market: Unlocking Growth Secrets, Trends and Develop...Kumar Satyam
According to TechSci Research report, “India Orthopedic Devices Market -Industry Size, Share, Trends, Competition Forecast & Opportunities, 2030”, the India Orthopedic Devices Market stood at USD 1,280.54 Million in 2024 and is anticipated to grow with a CAGR of 7.84% in the forecast period, 2026-2030F. The India Orthopedic Devices Market is being driven by several factors. The most prominent ones include an increase in the elderly population, who are more prone to orthopedic conditions such as osteoporosis and arthritis. Moreover, the rise in sports injuries and road accidents are also contributing to the demand for orthopedic devices. Advances in technology and the introduction of innovative implants and prosthetics have further propelled the market growth. Additionally, government initiatives aimed at improving healthcare infrastructure and the increasing prevalence of lifestyle diseases have led to an upward trend in orthopedic surgeries, thereby fueling the market demand for these devices.
As a business owner in Delaware, staying on top of your tax obligations is paramount, especially with the annual deadline for Delaware Franchise Tax looming on March 1. One such obligation is the annual Delaware Franchise Tax, which serves as a crucial requirement for maintaining your company’s legal standing within the state. While the prospect of handling tax matters may seem daunting, rest assured that the process can be straightforward with the right guidance. In this comprehensive guide, we’ll walk you through the steps of filing your Delaware Franchise Tax and provide insights to help you navigate the process effectively.
Discover the innovative and creative projects that highlight my journey throu...dylandmeas
Discover the innovative and creative projects that highlight my journey through Full Sail University. Below, you’ll find a collection of my work showcasing my skills and expertise in digital marketing, event planning, and media production.
The world of search engine optimization (SEO) is buzzing with discussions after Google confirmed that around 2,500 leaked internal documents related to its Search feature are indeed authentic. The revelation has sparked significant concerns within the SEO community. The leaked documents were initially reported by SEO experts Rand Fishkin and Mike King, igniting widespread analysis and discourse. For More Info:- https://news.arihantwebtech.com/search-disrupted-googles-leaked-documents-rock-the-seo-world/
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3.0 Project 2_ Developing My Brand Identity Kit.pptxtanyjahb
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2. Introduction
Sound plays an important role in our
lives.
It helps us to communicate with one
another.
We hear a variety of sounds in our
surroundings.
You must have hears the sound
produced by musical instruments like
flute, tabala, harmonium, etc.
3. Sound Is Produced By A
Vibrating Body
The to and fro or back and forth motion
of an object is called vibration.
When a tightly stretched band is plucked,
it vibrates and produces sound. When it
stops vibrating, it does not produce any
sound.
We see that vibrating object produces
sound.
In some cases, the vibrations are easily
visible to us. But in most cases, their
amplitude is so small that we cannot see
them. However we can feel them
4. Sound Produced By Humans
In humans, the sound is produced by the
voice box or the larynx.
The bump that seems to move when you
swallow is known as voice box.
It is at the upper end of the windpipe.
Two vocal cords, are stretched across
the voice box or larynx in such a way
that it leaves a narrow slit between them
for passage of air.
When the lungs force the air through the
slit, the vocal cord vibrate, producing
sound.
5. Muscles attached to the vocal cords
can make the cord tight or loose.
When the vocal cords are tight and
thin, the type and quantity of voice is
different from that when they are thick.
6.
7. Sound Needs A Medium For
Propagation
Activity - 1
Take a metal glass tumbler. Make sure
that it is dry. Place a cell phone in it.
Ask your friend to give a ring on the
cell phone. Listen to the ring carefully.
Now, surround the rim of the tumbler
with your hands. Put your mouth on
the opening between your hands.
Indicate to your friend to give a ring
again. Listen to the ring wile sucking
air from the tumbler.
8. If you had been able to suck all the air
in the tumbler, the sound would stop
completely.
Actually, sound needs a medium to
travel.
When air has been removed
completely from the vessel, it is said
that there is vacuum in the vessel.
The sound cannot travel through
vacuum.
9. Activity – 2
Does sound travel through water ?
Take a bucket. Fill it with clean water.
Take a small bell in one hand. Shake
this bell inside the water to produce
sound. Make sure that the bell does
not touch the body of the bucket.
Place your ear gently on the water
surface. You can hear the sound of the
bell. This indicates that sound travel
through water.
10. Activity – 3
Does sound travel through solids ?
Take a meter scale and hold it in one
end of your ear. Ask your friend to
gently tap or scratch the other end of
the scale. You can hear the sound of
scratching.
Vibrating objects produce sound and it
is carried in all directions in a medium
11. We Hear Sound Through Our
Ears
The shape of the outer part of the ear is
like a funnel.
When sound enters it, it travels down a
canal at the end of which a thin
membrane is stretched tightly. It is called
the eardrum. It performs an important
function.
The eardrum is like a stretched rubber
sheet. Sound vibrations make the
eardrum vibrate.
The eardrum send vibrations to the inner
ear. From there the signal goes to brain.
That is how we hear.
12.
13. Amplitude, Time Period And
Frequency Of A Vibration
The to and fro motion is vibration, this
motion is also called oscillatory
motion.
The number of oscillations per second
is called the frequency of oscillation.
Frequency is expressed in hertz. Its
symbol is Hz.
A frequency of 1 Hz is one oscillation
per second.
14. Amplitude and frequency are two
important properties of any sound.
The loudness of sound depends on its
amplitude.
When the amplitude of a vibration is
large, the sound produced is loud.
When the amplitude is small, the
sound produced is feeble.
15. The frequency determines the shrillness
or pitch of a sound.
If frequency of vibration is higher we say
that the sound is shrill and has a higher
pitch. If the frequency of vibration is
lower, we say that the sound has a lower
pitch.
E.g. A drum vibrates with low frequency.
Therefore it produces a low pitched
sound. On the other hand, a whistle has
a high frequency and therefore,
produces a sound of higher pitch.
16. Audible And Inaudible Sounds
The sounds of frequencies less than 20
vibrations per second (20 Hz) cannot be
detected by a human ear. Such sounds
are called inaudible.
On the higher side, sound of frequencies
higher than about 20,000 vibrations per
second (20 kHz) are also not audible to
human ear.
The range of audible frequencies in
human ears is roughly from 20 to 20,000
Hz.
17. Noise And Music
Unpleasant sounds are called noise.
In a classroom all the children starts to
speak together they produces noise.
We enjoy musical sound. The musical
sound is one which is pleasing to ear.
18. Noise Pollution
Similarly, presence of excessive or
unwanted sounds is called noise
pollution.
Major causes of noise pollution are
sound of vehicles, explosions
including bursting of crackers,
machines, loudspeakers etc.
Television and transistor radio at high
volumes, some kitchen appliances,
desert coolers, air conditioners, all
19. Harms Of Noise Pollution
The presence of excessive noise in
the surroundings may cause many
health related problems.
Lack of sleep, hypertension (high
blood pressure), anxiety and many
more health disorders may be caused
by noise pollution.
A person who is exposed to loud
sound continuously may get
temporary or permanent impairment of
hearing.
20. Measures To Limit Noise
Pollution
To control noise, we must control
sources of noise.
Silencing devices must be installed in
aircraft engines, transport vehicles,
industrial machines and home
appliances.
All noisy operations must be
conducted away from any residential
area.
Noise producing industries must be
21. Use of automobile horns should be
minimized.
TV and music systems should be run
at low volumes.
Trees must be planted along the roads
and around buildings to cut down on
the sounds reaching the residents,
thus reducing the harmful effects of
noise pollution.