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Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 21

9702Progressive waves

A progressive sound wave in air has amplitude x0 and intensity I. The amplitude of the wave increases to 3x0. What is the new intensity of the wave?

  1. AI/9
  2. BI/3
  3. C3I
  4. D9I

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Correct answer: D. 9I

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