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中学物理学中波的传播是一教学难点，其中纵波的传播更为抽象。但目前并未见到能够模拟纵波传播这种复杂运动的投影片。自己在电教实践中试制了这一活动片，在物理教学中起到了化难为易、变抽象为具体的作用，取得了较好的教学效果，现介绍如下： 一、制作 １．制作底片：取一
Wave propagation in middle school physics is a difficult teaching point, of which the propagation of longitudinal waves is more abstract. However, no projection film capable of simulating the complex motion of longitudinal wave propagation has not been seen so far. I tried this activity piece in the practice of audio-visual education, played a difficult role in physics teaching, changed abstraction as a concrete function, and achieved good teaching effect. Now I introduce it as follows: 1. Production film: take one