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Physics (AS & A Level) · May / June 2026 · Paper 11 · Question 29

9702Interference

What is a condition for two sources of waves to produce an interference pattern?

  1. AThe waves must be electromagnetic waves.
  2. BThe waves must be emitted with a constant phase difference.
  3. CThe waves must be emitted with the same amplitude.
  4. DThe waves must be emitted with the same intensity.

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Correct answer: B. The waves must be emitted with a constant phase difference.

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