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52 A whistle revolves in a circle with angular speed 20 rad s using a...

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52 A whistle revolves in a circle with angular speed 20 rad s 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 who is far away from the centre Vsound 340 m s 1 385 Hz 3 394 Hz 2 374 Hz 4 333 Hz

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