本题目来源于试卷: Physics Unit24: Wave Nature of Light，类别为 通用国际物理
[单选题]
One beam of coherent lawm*tok4:i/( ,qfz s-raarw/igv*a 0bgd rzs*8a7s2 coht travels path $P_1$ 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:
暂无
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