A-LevelPhysicsWaves9702/12 · Feb/Mar 2018 · Q291 Mark
Which statement gives a condition that enables diffraction to occur?
Asource of waves moves towards a stationary observer.
Bwave is partially blocked by an obstacle.
CTwo coherent waves are superposed.
DTwo waves of equal speed and frequency are travelling through the same part of a medium in opposite directions.
✓ Correct answer
B: wave is partially blocked by an obstacle.
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