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Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 23

9702Progressive waves

A sound wave of frequency 270 Hz is recorded by a cathode-ray oscilloscope (CRO). The waveform on the CRO is shown. What is the time-base setting on the CRO?

  1. A0.1 ms cm⁻¹
  2. B1 ms cm⁻¹
  3. C10 ms cm⁻¹
  4. D100 ms cm⁻¹

As printed in the paper

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Correct answer: B. 1 ms cm⁻¹

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