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1.选取相距一倍波长的点为替代点例1 一列简谐横波沿x轴正方向传播,频率为5Hz,某时刻的波形如图1所示,介质中质元 A 在距原点 O 为8cm 处,质元 B 在距原点 O 为16cm 处,从图象对应的时刻算起,质元 A 的运动状态与图示时刻质元 B 的运动状态相同所需的最短时间为( )
1. Select a point that is one wavelength apart as an alternative point. Example 1 A simple harmonic wave propagates along the positive direction of the x-axis at a frequency of 5 Hz. The waveform at a certain moment is shown in Figure 1. The mass A in the medium is 8 cm from the origin O. At the point where the element B is 16cm away from the origin O, the minimum time required for the motion state of the element A to be the same as the motion state of the element B at the illustrated moment from the time corresponding to the image is ()