8MasteringPhysics: Exam 2 Review-Google Chrome a https://session. masteringphysi

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8MasteringPhysics: Exam 2 Review-Google Chrome a https://session. masteringphysics.com/myct/itemview?assignmentproblemlD 757139988 offset next Signed in as janxing w 61 Exam Review Problem 16.43 Problem 16.43 Part A A bat locates insects by emitting ultrasonic How fast would the bat have to fly for you to just barely be able to hear the chirp at 20 kHz? "chirps' and then listening for echoes from the Express your answer to two significant figures and include the appropriate units. bugs. Suppose a bat chirp has a frequency of 25 kHz. Value Units Submit My Answers Give Up Part B In what direction would the bat have to fly? away from you toward you in other direct Submit My Answers Give Up rview All Assignments

Explanation / Answer

Applying doppler effect,

f = (v + v_r) f0 / (v + v_s)

v_r = velcoity of reciver = 0

v_s = velocity of source = u

v = velocity of wave (sound) = 343 m/s

20 = (343)(25) / (343 + u)

274.4 + 0.8u = 343

u = 85.75 m/s ...........Ans(A)

(B) u is positive then it means that source is moving away from the receiver.

Ans : Away from you

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