Question

What is droppler effect in sound?obtain an expression for the observed frequency of sound produced by a source when the observer is moving toward the stationary source and the medium is at rest.

Answer 1

f'=f(Vmedium+Vobserver)/Vmedium

Answer 2

When a sounding body passes near a stationary person, a considerable change in the pitch of sound is detected. When the body is approaching, the pitch of the sound increases where as the pitch of sound decreases when the sounding body is moving away. A similar change in pitch also occurs when a moving listener passes a stationary source of sound.

All these apparent changes in the pitch of sound are referred to as 'DOPPLER'S EFFECT'.

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