在机械波一章中,我们常常看到有关相干波中平衡位置的判断问题.如下面的两个习题便是.原题如下:图1例1.如图1所示表示两列相干水波的叠加情况,图中实线表示波峰,虚线表示波谷.设两列波振幅均为5cm且图示的范围内振幅不变.波速和波长分别为1m/s和0.5m.C是B、E连线中点.下列说法 In the mechanical wave chapter, we often see the problem of the determination of the equilibrium position in the coherent wave. For example, the following two exercises are: The original problem is as follows: Figure 1 Example 1. As shown in Figure 1, two coherent water waves are superimposed In the case, the solid line in the figure indicates the crest, and the dashed line indicates the trough. The two wave amplitudes are both 5 cm and the amplitude in the illustrated range is constant. The wave speed and wavelength are 1 m/s and 0.5 mC, respectively, which are the midpoints of the B and E lines. The following statement