πŸ“Š Physics
Q. There is no Doppler effect for sound when
  • (A) the source produces a sound of very high frequency
  • (B) the source of sound recedes from the observer
  • (C) the source of sound approaches the observer
  • (D) the source of sound moves at right angle to the line joining the source and the observer
βœ… Correct Answer: (D) the source of sound moves at right angle to the line joining the source and the observer

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