Question

Detemine the apparent frequency when sound source is in stationary and listener is in motion?

Answer 1

The apparent change in the pitch or frequency of sound due to relative motion of source of sound and the listener is called 'DOPPLER'S EFFECT'.

 

Explanation :

When a sounding body passes closes to a stationary person, a considerable alteration in the pitch of sound is established. When the body is attaining, the pitch of the sound surging up where as the pitch of sound decreases when the sounding body is moving away. A similar alteration 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