Two light waves of the same frequency are represented by the diagram. [Figure showing two sinusoidal displacement-phase angle graphs. Both start at 0 displacement; the solid line increases initially, while the dashed line decreases initially. The solid line peaks at 90°, the dashed line peaks around 280° and has a minimum around 100°.]
What could be the phase difference between the two waves?

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2015 examination, Paper 1 Variant 2 (9702_s15_qp_12.pdf).

Question

Two light waves of the same frequency are represented by the diagram. [Figure showing two sinusoidal displacement-phase angle graphs. Both start at 0 displacement; the solid line increases initially, while the dashed line decreases initially. The solid line peaks at 90°, the dashed line peaks around 280° and has a minimum around 100°.]
What could be the phase difference between the two waves?

Oracle Prep · Accepted Answer

The correct answer is C: 260°.

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