Exam-style question
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Explain the conditions necessary for sustained interference to occur in a double-slit experiment.
Model answer
What a good answer should say
- Sustained interference occurs when coherent light sources are used, the light waves have a constant phase difference, and the path difference between the waves is an integer multiple of the wavelength.
Explanation
Why this works
This question assesses understanding of the conditions required for sustained interference, focusing on coherence and path difference. A strong answer clearly outlines the need for coherent sources and the significance of phase and path differences in producing stable interference patterns.
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