A-LevelPhysicsWaves9702/12 · Feb/Mar 2022 · Q211 Mark
A cathode-ray oscilloscope (CRO) is used to determine the frequency of a sound wave. The diagram shows the waveform on the screen. [Figure 21.1] The time-base setting is 5.0 ms div⁻¹. What is the best estimate of 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.
A50 Hz
B71 Hz
C100 Hz
D143 Hz
✓ Correct answer
B: 71 Hz
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