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Q:

The observer hears a sound from the source which is moving away from the observer who is stationary. Determine the frequency of the sound

  • 1
    It is halved
  • 2
    It remains the same
  • 3
    It reaches infinity
  • 4
    It gets doubled
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Answer : 1. "It is halved"
Explanation :

If the observer is moving away from the source ((Figure)), the observed frequency can be found: λs=vTo−voTovTs=(v−vo)Tov(1fs)=(v−vo)(1fo)fo=fs(v−vov).


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