A-LevelPhysicsSuperpositionMay/June 2016Paper 1 Q271 Mark
Sound waves of wavelength λ are emitted by a loudspeaker and pass through two slits P and Q. Two sound waves from the slits meet at R. [Figure 27.1] What is the condition for an intensity maximum (loud sound) to be detected by a microphone at R?
AThe amplitudes of the two waves at R must be the same.
BThe distance PQ must be smaller than the wavelength λ.
CThe two waves from the slits must have travelled the same distance to R.
DThe two waves must be in phase at R.
✓ Correct Answer
The correct answer is D: The two waves must be in phase at R.
📋 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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