高中《物理》第二册 (必修加选修 )第十章“多普勒效应”中有一重要内容 :波源运动 ,观察者不动 ,如波源S1运动到S2 ,波源右方的波面变得密集 ,波长变短 ,左方的波面变得稀疏 ,波长变长 ,如图 1所示 .这一教学过程是整节课的重点和难点 .教师授课时一般采用多媒体动画演示辅助 There is an important content in the Doppler Effect in the second volume of the “Physics” of high school (Challenge plus elective): the wave source moves and the observer does not move. If the wave source S1 moves to S2, the wavefront on the right side of the wave source becomes dense. As the wavelength becomes shorter, the wavefront on the left becomes sparse and the wavelength becomes longer, as shown in Fig. 1. This teaching process is the focus and difficulty of the whole class. The teacher generally uses multimedia animations to assist in teaching.