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A whistle revolves in a circle with angular speed ω=20 rad /sec c 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 center ⋅vsound =340m/s.

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a

385 Hz

b

374 Hz

c

394 Hz

d

333Hz

answer is B.

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Detailed Solution

Linear velocity V=rω =50×10−3×20=10m/s When the source is moving away from the observer n′=nVsound V+Vsound =385×34010+340 =385×3435=374Hz

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A whistle revolves in a circle with angular speed ω=20 rad /sec c 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 center ⋅vsound =340m/s.