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人教版初二物理第三章《声音的发生和传播》中,课文是通过音叉振动、喉头振动的演示实验来讲述声音的发生和传播的。在多年的教学实践中,笔者总觉得这些实验的明显度还是不够。为此,笔者改用以下实验来说明声音的发生和传播,效果很好。所需器材:音箱用6.5-8寸的大功率低音喇叭1只、学生电源1台、约10cm×30cm稍厚的纸带1条。
In the second chapter of the second edition of Physics of the People’s Education Press, “The Occurrence and Propagation of Sound,” the text describes the occurrence and spread of sound through demonstration experiments of tuning fork vibration and laryngeal vibration. In years of teaching practice, I always feel that the obviousness of these experiments is still not enough. For this reason, the author uses the following experiment to explain the occurrence and spread of sound, and the effect is very good. Required equipment: 1 high-power woofer with a 6.5-8 inch speaker, 1 student power supply, and a thick paper tape of about 10cm×30cm.