A-LevelPhysicsSuperposition9702/12 · May/June 2021 · Q281 Mark
In a two-source interference experiment, light of a single frequency is incident on a double slit. The light waves emerging from the slits are coherent. What is meant by coherent?
AThe waves are in phase.
BThe waves have a constant phase difference.
CThe waves have the same amplitude.
DThe waves interfere constructively wherever they overlap.
✓ Correct answer
B: The waves have a constant phase difference.
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