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. part a how fast would the bat have to fly for you to just barely be able to hear the chirp at 20 khz?

Question

Laura Buck

Physics

13 August, 14:20

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. part a how fast would the bat have to fly for you to just barely be able to hear the chirp at 20 khz?

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Slade Wheeler · Answer 1

The speed for someone to hear the bat is categorized by the Doppler Effect. In order for a person to hear the bat v would have to be the speed of sound in the air (340/m/s) and v_b would be the speed of the bat. Therefore, v_b = v (f_bat - f_obs) / f_obs = 85 m/s would be the answer.