两列平面简谐相干波的振幅都是A,它们在空间P点相遇,若测得P点处质元t时刻的位移为y=A,则。
A.P点处肯定干涉相消
B.P点处肯定干涉相长
C.P点处可能干涉相消
D.P点处可能干涉相长
正确答案是D
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