A-LevelPhysicsSuperposition9702/12 · May/June 2017 · Q291 Mark

Two wave sources are oscillating in phase. Each source produces a wave of wavelength λ. The two waves from the sources meet at point X with a phase difference of 90°. What is a possible difference in the distances from the two wave sources to point X?

Aλ / 8

Bλ / 4

Cλ / 2

Dλ

✓ Correct answer

B: λ / 4

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2017 Paper 1 Variant 2, question 29.

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