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Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 20

9702Progressive waves

A microphone is connected to a cathode-ray oscilloscope (CRO). The diagram shows the waveform on the display of the CRO when the microphone detects a sound. The y-gain is set to 1 V div⁻¹. The time-base is set to 2.0 ms div⁻¹. Which row gives the amplitude and frequency of the waveform?

  1. Aamplitude / V: 3, frequency / Hz: 125
  2. Bamplitude / V: 3, frequency / Hz: 250
  3. Camplitude / V: 6, frequency / Hz: 125
  4. Damplitude / V: 6, frequency / Hz: 250

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Correct answer: B. amplitude / V: 3, frequency / Hz: 250

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