A-LevelPhysicsWavesMay/June 2023Paper 1 Q201 Mark
A microphone detects a sound wave. The microphone is connected to a cathode-ray oscilloscope (CRO). The shape of the trace on the screen of the CRO is shown. [Figure 20.1] Which property of the sound wave can be determined by using only the measurement of a horizontal distance on the screen and the value of a control setting of the CRO?
Aamplitude
Bfrequency
Cspeed
Dwavelength
✓ Correct Answer
The correct answer is B: frequency
📋 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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