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Physics (AS & A Level) · May / June 2018 · Paper 13 · Question 22

9702Progressive waves

A cathode-ray oscilloscope (c.r.o.) 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. What is the frequency of the sound wave?

  1. A57 Hz
  2. B71 Hz
  3. C114 Hz
  4. D143 Hz

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Correct answer: B. 71 Hz

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