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Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 30

9702Interference

Two wave sources emit coherent waves. Which condition must be correct for the coherent waves?

  1. AThe waves are emitted in phase.
  2. BThe waves are emitted and move in opposite directions.
  3. CThe waves are emitted with a constant phase difference.
  4. DThe waves are emitted with the same amplitude.

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Correct answer: C. The waves are emitted with a constant phase difference.

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