A-LevelPhysicsSuperposition9702/12 · May/June 2015 · Q261 Mark

What is not an essential condition for an observable interference pattern to occur between the waves from two sources?

AThe frequencies of the two sources must be equal.

BThe sources must be coherent.

CThe sources must emit waves of equal amplitude.

DThe waves from the two sources must overlap.

✓ Correct answer

C: The sources must emit waves of equal amplitude.

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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 26.

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