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Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 24

9702Progressive waves

A sound wave is displayed on the screen of a cathode-ray oscilloscope (c.r.o.) as shown. The time-base of the c.r.o. is set at 2.5 ms cm⁻¹. What is the frequency of the sound wave?

  1. A50 Hz
  2. B100 Hz
  3. C200 Hz
  4. D400 Hz

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Correct answer: B. 100 Hz

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