A bat locates insects by emitting ultrasonic "chirps" and then listening for echoes from the...

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A bat locates insects by emitting ultrasonic "chirps" and then listening for echoes from the bugs. Suppose a bat chirp has a frequency of 25 kHz. In what direction would the bat have to fly for you to just barely be able to hear the chirp at 20 kHz? ? away from you toward you in another direction How fast would the bat have to fly for you to just barely be able to hear the chirp at 20kHz?

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