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Question

A stationary source producing a sound of frequency 900 Hz. What will be the frequency of the sound heard by the listener revolving around the source with a uniform velocity of 8 m s1? (velocity of sound is 350 m s1)
  1. 920 Hz
  2. 880 Hz
  3. 0 Hz
  4. 900 Hz


Solution

The correct option is D 900 Hz
Doppler effect is not seen in case of uniform circular motion. Since the listener is moving around the source with uniform velocity, the frequency and the velocity of the sound emitted by the source do not matter; the frequency of the sound perceived by the listener will be the same as that emitted by the source.

Therefore, the frequency of the sound heard by the listener =900 Hz

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