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Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 21

9702Progressive waves

A cathode-ray oscilloscope (CRO) is used to determine the frequency of a sound wave. The diagram shows the waveform on the screen. The time-base setting is 5.0 ms div⁻¹. What is the best estimate of the frequency of the sound wave?

  1. A50 Hz
  2. B71 Hz
  3. C100 Hz
  4. D143 Hz

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Correct answer: B. 71 Hz

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