A-LevelPhysicsWavesOct/Nov 2019Paper 1 Q221 Mark
A microphone is connected to a cathode-ray oscilloscope (CRO). When a tuning fork is struck and then held next to the microphone, the following waveform is shown on the display of the CRO. [Figure showing a CRO screen displaying a sinusoidal waveform with 4 divisions per complete cycle] The time-base setting on the CRO is 2.00 ms per division. What is the best estimate of the frequency of the sound produced by the tuning fork?
A63 Hz
B170 Hz
C250 Hz
D500 Hz
✓ Correct Answer
The correct answer is C: 250 Hz
📋 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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