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Question

In the figure shown a source of sound of frequency 510Hz moves with constant velocity null in the direction shown. The wind is blowing at a constant velocity null towards an observer who is at rest at point B. Corresponding to the sound emitted by the source at initial position A, the frequency detected by the observer is equal to (speed of sound relative to air = 330 m/s)

  1. 510Hz    
  2. 500 Hz    
  3. 525 Hz    
  4. 550 Hz    

The correct answer is: 525 Hz

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