a siren emitting a sound of frequency 800Hz moves away from an observer towards a cliff at a speed of 15m/s-1. then, the frequency of sound that the observer hears in the echo reflected from the cliff is?
(take velocity of sound in air = 330ms-1)
a) 885Hz
b) 765Hz
c) 800Hz
d) 838Hz
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Please refer the theory written by me. It will help you in solving other similar problems based on Doppler's effect.
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