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Physics (AS & A Level) · Feb / March 2020 · Paper 12 · Question 21

9702Progressive waves

A wave of frequency 15 Hz travels at 24 m s–1 through a medium. What is the phase difference between two points 2.0 m apart?

  1. AThere is no phase difference.
  2. BThey are out of phase by a quarter of a cycle.
  3. CThey are out of phase by half a cycle.
  4. DThey are out of phase by 0.80 of a cycle.

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Correct answer: B. They are out of phase by a quarter of a cycle.

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