Question

How sound is produced by vibrating object in a medium reach your ear

Answer 1

It reaches us through the medium in which it is travelling by forming compressions and rarefactions.

Answer 2

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When an object vibrates, it necessitates the surrounding particles of the medium to vibrate. The particles that are adjacent to vibrating particles are forced to vibrate. Hence the sound produced by a vibrating object in a medium is transferred from particle to particle till it reaches your ear.