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Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 25

9702Progressive waves

A sound wave is detected by a microphone and displayed on the screen of a cathode-ray oscilloscope (CRO). The frequency of the wave is 2.5 kHz. What is the setting on the time-base of the CRO?

  1. A0.1 ms cm⁻¹
  2. B0.4 ms cm⁻¹
  3. C0.1 s cm⁻¹
  4. D0.4 s cm⁻¹

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Correct answer: A. 0.1 ms cm⁻¹

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