A-LevelPhysicsSuperposition9702/12 · May/June 2016 · Q271 Mark

Sound waves of wavelength λ are emitted by a loudspeaker and pass through two slits P and Q. Two sound waves from the slits meet at R. [Figure 27.1] What is the condition for an intensity maximum (loud sound) to be detected by a microphone at R?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThe amplitudes of the two waves at R must be the same.

BThe distance PQ must be smaller than the wavelength λ.

CThe two waves from the slits must have travelled the same distance to R.

DThe two waves must be in phase at R.

✓ Correct answer

D: The two waves must be in phase at R.

Oracle Prep sorts past-paper questions by topic, so you can drill Superposition and see which topics are most likely to come up next.

Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2016 Paper 1 Variant 2, question 27.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content