Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 29

Which statement gives a condition that enables diffraction to occur?

1. AA source of waves moves towards a stationary observer.
2. BA wave is partially blocked by an obstacle.
3. CTwo coherent waves are superposed.
4. DTwo waves of equal speed and frequency are travelling through the same part of a medium in opposite directions.

As printed in the paper