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Physics (AS & A Level) · Oct / Nov 2024 · Paper 11 · Question 27

9702Interference

Three statements about two progressive waves are listed. 1 The waves have the same frequency. 2 The waves have the same amplitude. 3 The waves are emitted with a constant phase difference. Which statements must be correct for the two waves to be coherent?

  1. A1, 2 and 3
  2. B1 and 2 only
  3. C1 and 3 only
  4. D2 and 3 only

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Correct answer: C. 1 and 3 only

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