例1如图1所示,一列简谐波沿x轴正向传播,各质点的振幅都是2cm.某时刻相距30m的两质点a、b的位移都是1cm,只是速度方向相反,va沿y轴负方向,vb沿y轴正方向.则这列波的波长最大可能是多少?解析先画出一列简谐波如图2所示,标明波的传播方向,按照题意标出a、b的位置.固定点a的位置后 Example 1 As shown in Figure 1, a series of harmonic waves propagates along the x-axis in the forward direction. The amplitude of each particle is 2cm. The displacement of two particles a and b at a time of 30m is 1cm, but the velocity is opposite to that of the va. The y-axis negative direction, vb along the y-axis positive direction. Then the maximum wavelength of this wave may be? Analysis first draw a list of simple harmonics as shown in Figure 2, marked the direction of wave propagation, according to the problem marked a, Position of b. After fixing point a