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A-LevelPhysicsWaves9702/12 · May/June 2021 · Q231 Mark

A sound wave is detected by a microphone that is connected to a cathode-ray oscilloscope (CRO). The screen of the CRO displays a waveform, as shown. [Figure 23.1] The time-base is set to 20 µs div⁻¹. What is the frequency of the sound wave?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A15 Hz

B15000 Hz

C20000 Hz

D30000 Hz

✓ Correct answer

B: 15000 Hz

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About this question

Topic: Waves, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2021 Paper 1 Variant 2, question 23.

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