A-LevelPhysicsSuperpositionFeb/Mar 2022Paper 1 Q241 Mark
Two coherent progressive waves from different sources meet at a point. Which condition must be satisfied for there to be zero resultant amplitude at the point where the waves meet?
AThe two waves must be emitted from their sources with the same intensity.
BThe two waves must be in phase with each other at the point.
CThe two waves must be travelling in opposite directions.
DThe two waves must have the same amplitude at the point.
✓ Correct Answer
The correct answer is D: The two waves must have the same amplitude at the point.
📋 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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