Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 24

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?

1. AThe two waves must be emitted from their sources with the same intensity.
2. BThe two waves must be in phase with each other at the point.
3. CThe two waves must be travelling in opposite directions.
4. DThe two waves must have the same amplitude at the point.

As printed in the paper