Physics (AS & A Level) · May / June 2021 · Paper 12 · Question 28
9702Interference
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.
As printed in the paper
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Correct answer: B. The waves have a constant phase difference.
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