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Physics (AS & A Level) · Oct / Nov 2024 · Paper 11 · Question 28

9702Interference

Waves P and Q have the same amplitude. The waves meet in phase at point X and interfere to give a resultant wave with intensity I. The amplitude of wave P is doubled. What is the new intensity of the resultant wave at X, in terms of I?

  1. A0.44I
  2. B1.5I
  3. C2.3I
  4. D3.0I

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Correct answer: C. 2.3I

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