Exam-style question
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What is the condition needed for sustained interference in light waves?.
- A.The waves must have the same frequency.
- B.The waves must travel in different directions.
- C.The waves must have different amplitudes.
- D.The waves must be polarized.
Model answer
What a good answer should say
- The waves must have the same frequency.
Explanation
Why this works
Sustained interference occurs when two or more waves of the same frequency and phase overlap, leading to a consistent pattern of constructive and destructive interference.
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