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Q. A travelling wave passes a point of observation where the time interval between successive crests is 0.2 s. Which of the following is then true?
  • (A) The frequency of 5 Hz.
  • (B) The wavelength is 5 m
  • (C) The wavelength is 0.2 m
  • (D) The velocity of propagation is 5 m/s
✅ Correct Answer: (A) The frequency of 5 Hz.

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