题目内容
（请给出正确答案）
As shown in the figure , two coherent waves with wavelength
meet at point P. The initail phase of the wave is
at point
, and the distance form pointto point P is
. The initial phase of the wave is
at the point
, and the distance form pointto point P is
. Let k to be zero, positive or negative integer, then the condition for point P is the maximum interference is ().
A、
B、
C、
D、
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