7.平面简谐波沿x轴传播,波长 =2.5m。A、B为波线上相距为Δx=1.0m的两个点,则A、B 两点的相位差Δ =( )
A. π B. π
C. π D.π
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7.平面简谐波沿x轴传播,波长 =2.5m。A、B为波线上相距为Δx=1.0m的两个点,则A、B 两点的相位差Δ =( )
A. π B. π
C. π D.π
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