Exam-style question
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What is the condition for constructive interference to occur?.
- A.Path difference is an odd multiple of half the wavelength.
- B.Path difference is an even multiple of the wavelength.
- C.Path difference is zero.
- D.Path difference is equal to one wavelength.
Model answer
What a good answer should say
- Path difference is an even multiple of the wavelength.
Explanation
Why this works
Constructive interference occurs when the path difference between two waves is an even multiple of the wavelength, leading to the waves being in phase and reinforcing each other.
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