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Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 28

9702Progressive waves

A cathode-ray oscilloscope (CRO) is used to display the trace from a sound wave. The time-base is set at 5 µs mm⁻¹. What is the frequency of the sound wave?

  1. A6.7 Hz
  2. B67 Hz
  3. C6.7 kHz
  4. D67 kHz

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Correct answer: C. 6.7 kHz

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