A-LevelPhysicsWavesMay/June 2020Paper 1 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?
A330 Hz, 0.6 mV
B330 Hz, 1.2 mV
C670 Hz, 0.6 mV
D670 Hz, 1.2 mV
✓ Correct Answer
The correct answer is A: 330 Hz, 0.6 mV
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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