A-LevelPhysicsSuperpositionOct/Nov 2021Paper 1 Q291 Mark
Two waves, each with a constant amplitude, interfere and produce an interference pattern. The pattern has minima at fixed points where the displacement is zero at all times. Which statement describes the two waves?
AThey must be coherent and of the same amplitude.
BThey must be coherent but not necessarily of the same amplitude.
CThey must be of the same amplitude but not necessarily coherent.
DThey must not be coherent or of the same amplitude.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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