Question

A bat at rest sends out ultrasonic sound waves at 50.5 kHz and receives them returned from an object moving directly away from it at 34.0 m/s .

Part A

What is the received sound frequency?

Answer 1

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We have: = 34 my and fo= 50.5 kMz Accoraling to doppler effect f Where vis speed of saund 343 ns (34-mk). (50.5Hz) (343 mys)) f'= f=45.49 k Hz .. Now, Since the source is moving qway: hevefore; f" f' (45.49 khz) 1 (34ms) I Vo 343 m) f"41.39 kMz Ans