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Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 23

9702Progressive waves

The displacement–time graph for an air particle in the path of a sound wave is shown. Which property of the sound wave must be increasing?

  1. Aamplitude
  2. Bfrequency
  3. Cperiod
  4. Dspeed

As printed in the paper

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Correct answer: B. frequency

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