一、会看波动图像(线)【例1]简谐横波在x轴上传播,在某时刻的波形如图1所同样波速为lexx此,或示,已知此时质点F的运动方向向下,则 A.此波朝x轴负方向传播; B.质点D此时向下运动; C.质点B将比质点C先回到平衡位置; D.质点E的振幅为零. [解析」质点F向下运动,根据平移法(或爬坡法 First, we will see the wave image (line) [Example 1] The harmonic wave propagates on the x-axis. The waveform at a certain moment is the same as the lexx wave velocity shown in Fig. 1. Or, the motion direction of the particle F is known at this time. Next, A. This wave propagates in the negative direction of the x-axis; B. The mass D moves downwards at this time; C. The mass B will return to the equilibrium position before the particle C; D. The amplitude of the particle E is zero. [Analysis] The particle F moves downwards according to the translation method (or climbing method)