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A bat, flying at 20.0 m/s, emits a chirp at 40.0 kHz. If this sound pulse...



A bat, flying at 20.0 m/s, emits a chirp at 40.0 kHz. If this sound pulse is reflected by a wall, what is the frequency of the echo received by the bat? (V sound = 340 m/s. unit in kHz) 

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Answer #1

Here both source and observer is bat itself,

Using the doppler effect of sound formula,

f'=frequency of echo

f=original frequency

Vsound=Velocity of sound

Vbat=Velocity of bat

f'= [(Vsound+Vbat)/(Vsound-Vbat)] f

f'=[(340+20)/(340-20)]*(40khz)

f'=45khz

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