高中《物理》第二册 (试验修订本 ,必修加选修 )增加了“多普勒效应”,多普勒效应在现实生活中的应用非常广泛 ,该节内容的增加 ,改变了过去教材的不足 .在过去的教材中 ,学生只学习了波源与观察者或皆相对介质静止不动时的情景 ,对火车向观察者驶来或离观察者而去时汽笛音调的 The “Doppler Effect” has been added to the second volume of the “Physics” of the high school (experimental revision, compulsory revision), and the Doppler effect is widely used in real life. The increase in the content of this section has changed the shortcomings of the past teaching materials. In past teaching materials, students only studied the situation where the wave source and the observer or both were stationary, and the tone of the whistle was when the train came to the observer or left the observer.