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An observer a sitting on a cart executin...

An observer a sitting on a cart executing SHM between A and B listens to a whistle which rotates in a circle with constant speed 5 m/s as shown.The maximum speed of the car is same as that of whistle . If frequency of the whistle is 640 Hz,then maximum possible frequency observed by observer is [Speed of sound in air= 320 m/s]

A

670 Hz

B

650 Hz

C

630 Hz

D

660 Hz

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