本题目来源于试卷: Physics Unit24: Wave Nature of Light，类别为 国际高中通用物理
[单选题]
One beam of coherent light trfpvclus33 / v:avels p *e; )q8jfz1 y ir6n/xmkdrzv7b9a:qhath $P_1$ in arriving at point Q and another coherent beam travels path $P_2$ in arriving at the same point. If these two beams are to interfere destructively, the path difference $P_1 - P_2$ must be equal to
A. an odd number of half-wavelengths.
B. zero.
C. a whole number of wavelengths.
D. a whole number of half-wavelengths.
参考答案: A
本题详细解析:
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