A-LevelPhysicsSuperposition9702/12 · May/June 2015 · 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?

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Adecreases steadily

Bincreases and decreases regularly

Cincreases steadily

Dremains constant

✓ Correct answer

B: increases and decreases regularly

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2015 Paper 1 Variant 2, question 27.

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