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Physics (AS & A Level) · May / June 2026 · Paper 11 · Question 26

9702Progressive waves

A wave is incident on a surface of area S placed perpendicular to the direction of travel of the wave. The wave has amplitude R and the power incident on the surface is P. The amplitude of the wave is increased to 3R and the wave is now incident normally on a surface of area 3S. What is the power incident on the surface of area 3S?

  1. AP
  2. B3P
  3. C9P
  4. D27P

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Correct answer: D. 27P

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