NEET | 2016Sound WavesHard

Question

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of15 ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is :
(Take velocity of sound in air =330 ms-1)

Options

A.

765 Hz

B.

800 Hz

C.

838 Hz

D.

885 Hz

Solution


f0=800Hz
Vsource=15 m/s
fa = 350(330-15)800=330315×800
fa = 838 Hz

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