A-LevelPhysicsWaves9702/12 · May/June 2020 · Q231 Mark
A microphone connected to the Y-plates of a cathode-ray oscilloscope (CRO) is placed in front of a loudspeaker. The trace on the screen of the CRO is shown. [Figure 23.1] The time-base setting is 0.5 ms cm⁻¹ and the Y-plate sensitivity is 0.2 mV cm⁻¹. What is the frequency of the sound from the loudspeaker and what is the amplitude of the trace on the CRO?
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.
A330 Hz, 0.6 mV
B330 Hz, 1.2 mV
C670 Hz, 0.6 mV
D670 Hz, 1.2 mV
✓ Correct answer
A: 330 Hz, 0.6 mV
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