10. A is moving about in a cave, navigating via ultrasonic beeps. Assume that th

Question

10. A is moving about in a cave, navigating via ultrasonic beeps. Assume that the sound emission frequency of the Hz. one fast swoop directly toward a wall surface, the bat is moving with a speed of 10 m/s. The speed of sound in air is 340 m/s. (a) If you had sound-detecting equipment mounted on the wall (as part of a research project you are doing for the course BATS101), find the frequency recorded in the detector. 30 DOD H 2. bat dau e 34 m V t No 30, D D (b) What frequency does the bat hear reflected off the wall? Nos Mo n is

Explanation / Answer

Part A

bat (source)is moving towards the wall so frequency recorded

f' = (V/V-Vs)f

f' = (340/340-10)30000

f' = 30909 Hz

Part B

now wall will behave as source and bat as observer so

frequency heard is

f'' = (V+Vo/V)f'

f'' = (340+10/340)30909

f'' = 31818Hz

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