Exam-style question
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What is the role of the coherent light source in Young's double-slit experiment?.
- A.To ensure light is absorbed
- B.To provide a constant phase relationship
- C.To increase the intensity of light
- D.To scatter light in different directions
Model answer
What a good answer should say
- To provide a constant phase relationship
Explanation
Why this works
A coherent light source ensures that the light waves maintain a constant phase relationship, which is essential for producing a clear interference pattern.
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