Exam-style question
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What is the condition for sustained interference to occur in a double-slit experiment?.
- A.The waves must be in phase
- B.The waves must be out of phase
- C.The wavelength must be zero
- D.The slits must be of different widths
Model answer
What a good answer should say
- The waves must be in phase
Explanation
Why this works
For sustained interference to occur, the waves from the two slits must be in phase, meaning they reach the screen at the same time and with the same phase relationship. This condition is essential for producing a stable interference pattern.
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