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A bat, flying at 4.70 m/s toward a wall, emits a chirp at 50.0 kHz. If...

A bat, flying at 4.70 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency, in kHz, of the echo received by the bat? (vsound = 340 m/s)

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