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声音在空气中的传播是由声源振动引起周围空气振动而形成的。这一点学生很难理解,原因是看不到空气的振动现象。人教版的初中教材中,用共振音叉来演示。其缺点,一是稍嫌复杂,不够直观;二是单摆振动不够明显。这里介绍一种改进的方案。
The propagation of sound in the air is caused by the vibration of the surrounding air caused by the vibration of the sound source. This is difficult for students to understand. The reason is that they do not see the vibration of air. The PEP teaching materials for junior high school use resonance tuning forks to demonstrate. The disadvantages are that it is a bit complicated and not intuitive; second, the vibration of the pendulum is not obvious enough. Here is an improved solution.