Question

if a are ringing bicycle Bell is held tightly by hand why does it stop producing sound what does it proves

Answer 1

when we close the bell with our hand there is no air supply over it sound can travel only in air

Answer 2

We are ringing bell in bicycle , therefore it vibrates to makes sound. If we stop the vibration by holding a hand on it it can't vibrate. So it does not make the sound.

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