A-LevelPhysicsSuperpositionMay/June 2015Paper 1 Q271 Mark
Source S emits microwaves with a constant amplitude. The microwaves hit a metal screen P and are reflected. A stationary wave is formed between S and P. The wavelength of the microwaves is much smaller than the distance between S and P. [Figure showing source S, detector Q, and metal screen P. Q moves from S to P.] A detector Q is moved at a slow, constant speed from S to P. What happens to the amplitude of the signal detected by Q?
Adecreases steadily
Bincreases and decreases regularly
Cincreases steadily
Dremains constant
✓ Correct Answer
The correct answer is B. 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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