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GK QUESTION#3019

A sound source and an observer move along the same straight line at identical constant subsonic velocities in uniform still air. How does the received frequency compare with the emitted frequency?

  1. AIt varies irregularly
  2. BIt remains the sameCorrect answer
  3. CIt becomes higher
  4. DIt becomes lower
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Answer

B. It remains the same

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Explanation

With source and listener moving together along one line at the same constant subsonic velocity relative to uniform still air, their separation stays fixed and the source and observer Doppler factors cancel. The received frequency equals the emitted frequency.

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