Question

vibrations in a body produce a sound how do we prove it

Answer 1

Vibrations in a body produce a sound

Proved !!

When you are on D.J floor you will feel some vibration in your body

This vibration is of those sound waves which passed through ears to the inner zone of the body..

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Answer 2

Let's understand it by an activity.  Take a metal tumbler and a metal spoon.Now strike the glass with the spoon you can see that the tumbler vibrates and produces a sound. Hence proved