A-LevelPhysicsSuperpositionFeb/Mar 2024Paper 1 Q291 Mark
Two loudspeakers are connected to the same signal generator. The signal generator produces a single frequency. The loudspeakers face each other so that a stationary sound wave is set up in the region between the loudspeakers. [Figure showing two loudspeakers facing each other, a microphone in between, and a CRO] A microphone is connected to a cathode-ray oscilloscope (CRO) and positioned between the two loudspeakers. The microphone is moved along a line joining the two loudspeakers. The signal on the CRO shows 5 maximum amplitudes as the microphone moves. The microphone moves a distance of 2.0m from the position that gives the first maximum to the position that gives the fifth maximum. What is the wavelength of the sound wave?
A0.40 m
B0.50 m
C0.80 m
D1.0 m
✓ Correct Answer
The correct answer is D: 1.0 m
📋 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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