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A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15 ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is : (Take velocity of sound in air = 330 ms-1)
  • a)
    885Hz
  • b)
    765 Hz
  • c)
    800 Hz
  • d)
    838 Hz
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A siren emitting a sound of frequency 800 Hz moves away from an observ...


 
Since the observer and the wall are stationary so frequency of echo observed by the observer will also
be 838 Hz.
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A siren emitting a sound of frequency 800 Hz moves away from an observ...
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A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speedof 15 ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is :(Take velocity of sound in air = 330 ms-1)a)885Hzb)765 Hzc)800 Hzd)838 HzCorrect answer is option 'D'. Can you explain this answer?
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