• 2021-04-14
    【单选题】一平面简谐波,其振幅为 A ,频率为 n .波沿 x 轴 负 方向 传播.设 t = t 0 时刻波形如图所示.则 x = 0 处质点的振动方程为
    A. y=Acos[2π n (t+t 0 )+π/2] B. y=Acos[2π n (t-t 0 )+π/2] C. y=Acos[2π n (t-t 0 )-π/2] D. y=Acos[2π n (t-t 0 )+π]