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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 15ms−1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is
(Take velocity of sound in air=330ms−1)
  • a)
    838 Hz
  • b)
    885 Hz
  • c)
    765 Hz
  • d)
    800 Hz
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A siren emitting a sound of frequency 800 Hz moves away from an obser...
Here, frequency of sound emitted by siren,
υ0 = 800Hz
Speed of source, vs = 15ms−1
Speed of sound in air,v = 330ms−1
Apparent frequency of sound at the cliff = frequency heard by observer = υ
Using Doppler's effect of sound
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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 15ms−1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is(Take velocity of sound in air=330ms−1)a)838 Hzb)885 Hzc)765 Hzd)800 HzCorrect answer is option 'A'. Can you explain this answer?
Question Description
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