A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2021 · Q291 Mark
Two waves, each with a constant amplitude, interfere and produce an interference pattern. The pattern has minima at fixed points where the displacement is zero at all times. Which statement describes the two waves?
AThey must be coherent and of the same amplitude.
BThey must be coherent but not necessarily of the same amplitude.
CThey must be of the same amplitude but not necessarily coherent.
DThey must not be coherent or of the same amplitude.
✓ Correct answer
A: They must be coherent and of the same amplitude.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Superposition and see which topics are most likely to come up next.
Sign up free →