A whistle revolves in a circle with an angular speed of 20 rad/sec using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer, which is far away from the centre in the same plane ? (v = 340 m/s)

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333 Hz

374 Hz

385 Hz

394 Hz

answer is B.

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Detailed Solution

Minimum frequency will be heard, when whistle moves away from the listener.nmin=n vv+vs where v=rω=0.5×10=1 m/s⇒nmin=385 340340+10=374 Hz

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