SOUNDSOUNDDONE BY: J.JEFRINADONE BY: J.JEFRINA

What is sound?What is sound?

Vibrations that travel through the air Vibrations that travel through the air or another medium and can be heard or another medium and can be heard when they reach a person's or when they reach a person's or animal's ear. animal's ear.

Sound plays an important role in ourSound plays an important role in our

life. It helps us to communicate with life. It helps us to communicate with one another. one another.

How is sound produced?How is sound produced? Produced by Vibrating BodyProduced by Vibrating Body The forth and back motion of an object is The forth and back motion of an object is

termed as vibrations .When a tightly termed as vibrations .When a tightly stretched band is plucked, it vibrates and stretched band is plucked, it vibrates and produces sound. When it stops vibrating, it produces sound. When it stops vibrating, it does not produce any sound.does not produce any sound.

Produced by humans, animals ,air etc.Produced by humans, animals ,air etc. The air caused by us produces sound when The air caused by us produces sound when

it passes the vocal cord.it passes the vocal cord. Animals and vehicles produces sound too.Animals and vehicles produces sound too.

How does sound travel?

A demonstration of how sound travels through the air or any other medium. Sound is transmitted from a source to the surrounding air particles, which vibrate or collide and pass the sound energy along to our ears. Without any particles to vibrate, we wouldn't hear the sound.

How do we hear sound?How do we hear sound?

The shape of the outer part of the ear The shape of the outer part of the ear is like a funnel. When sound enters in is like a funnel. When sound enters in it ,it travels down a canal at the end of it ,it travels down a canal at the end of which a thin membrane is stretched which a thin membrane is stretched tightly. It is called the eardrum.tightly. It is called the eardrum.

Sound can also cause pollution.Sound can also cause pollution.

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