A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2022 · Q241 Mark
Two coherent progressive waves from different sources meet at a point. Which condition must be satisfied for there to be zero resultant amplitude at the point where the waves meet?
AThe two waves must be emitted from their sources with the same intensity.
BThe two waves must be in phase with each other at the point.
CThe two waves must be travelling in opposite directions.
DThe two waves must have the same amplitude at the point.
✓ Correct answer
D: The two waves must have the same amplitude at the point.
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