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首先,通过对波的生成过程和波形图线的分析,使学生明确振动和波的区别和联系。振动是波动的成因,振动图线是表示单个质点的位移和时间的关系,是对单个质点周期性运动的“录象”;波动则是振动自波源开始由近及远的传播过程,波动图线是表示媒质中的质点集体在同一时刻的位移,也就是表示位移和空间关系的,是对各个质点周期性运动的“照相”。在波动
First of all, through the analysis of wave generation process and waveform diagrams, students can clearly distinguish between vibration and wave. Vibration is the cause of fluctuations. The vibration diagram is the relationship between the displacement of a single particle and time, and it is the video recording of the periodic motion of a single particle. The fluctuation is the propagation process of the vibration from the source to the near and far. Wave diagrams represent the displacement of masses in the media at the same time, that is to say the relationship between displacement and space. They are the “photographs” of periodic movements of various particles. In fluctuations