QuestionDetails: An airplane traveling at v = 162 m/s emits a sound of frequency

Question

QuestionDetails: An airplane traveling at v = 162 m/s emits a sound of frequency 4.20 kHz. At what frequency does a stationary listenerhear the sound during each of the following times? (Use 344 m/s asthe speed of sound.) (a) as the plane approaches kHz

b) after it passes kHz now i try two type of equation but still getting wrong ans. QuestionDetails: An airplane traveling at v = 162 m/s emits a sound of frequency 4.20 kHz. At what frequency does a stationary listenerhear the sound during each of the following times? (Use 344 m/s asthe speed of sound.) (a) as the plane approaches kHz

b) after it passes kHz now i try two type of equation but still getting wrong ans. QuestionDetails: An airplane traveling at v = 162 m/s emits a sound of frequency 4.20 kHz. At what frequency does a stationary listenerhear the sound during each of the following times? (Use 344 m/s asthe speed of sound.) (a) as the plane approaches kHz

b) after it passes kHz

Explanation / Answer

doppler effect with source moving toward observer .    freq heard = freq emitted * v /(v - s)   =   4.20 * 344 / (344 -162) =    7.94 kHz . doppler with source moving away from observer .      freq heard = freqemitted * v / (v + s)   =   4.20 *344 / (344 + 162) =    2.86 kHz

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