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A siren emtting a sound of frequency 800...

A siren emtting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15` ms ^(-1)`.Then the frequuency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound air =330 `ms^(-1)` )

A

765 Hz

B

800Hz

C

838 Hz

D

885 Hz

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The correct Answer is:
C
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MOTION-SOUND WAVES-Exercise - 3 (Section - A)
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  15. A uniform string of length 20 m & mass 1 kg is hung vertically. Find t...

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