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Sound Waves

Vibrations in...

Question

Vibrations in a body produce sounds. How do you prove it?

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Solution

Body vibrates and it reaches us through the vibrations of the particles of surrounding medium.The sounds requires a medium for propagation.The vibration of the body produce vibration in the particle of surrounding medium which travels in from of wave with a certain speed depending upon the density and elasticity of the medium.

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We know that sound is produced by a vibrating body. But in real life, why we can't see the vibrations of the body when it produce sound? [2 MARKS]

Q. Sound is produced by a body when it vibrates.

For sound to be produced by a body, vibrations should necessarily occur in the body.

Q. Take a metal plate (or a pan ). Hang it at a convenient place in such a way that it does not touch any wall. Now strike it with a stick (Fig.13.2). Do you hear a sound? Touch the plate or pan gently with your finger. Do you feel the vibrations? Again strike the plate with the stick and hold it tightly with your hands immediately after striking. Do you still hear the sound? Touch the plate after it stops producing sound. Can you feel the vibrations now?

Q. Justify the statement :

A non-vibrating body cannot produce sound.

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