Exam-style question
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Describe the conditions needed for sustained interference in light waves.
Model answer
What a good answer should say
- For sustained interference to occur, coherent light sources must be used, meaning they have a constant phase difference and the same frequency.
- Additionally, the light waves must overlap in space, allowing for constructive and destructive interference patterns to form.
Explanation
Why this works
This answer is strong because it clearly identifies the necessary conditions for sustained interference, which is a key concept in wave theory. The question tests the understanding of coherence and the behavior of light waves during interference.
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