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拍的形成是物理教学中的难点,教科书上给出的拍的图象一般都是通过数学计算或对两分振动图线进行迭加而得出的。对拍现象的感性认识,通常都是采用敲击两个频率相近的音叉,让学生倾听声音强弱的变化,由此体会合成振动振幅的变化。这种演示实验比较简单、形象,但很粗糙。最近我们设计制作的《拍的形成演示仪》(以下简称“拍仪”),教学效果比较理想。现简要介
The formation of pats is a difficult point in physics teaching. The images taken in textbooks are generally obtained through mathematical calculation or superposition of two-divided vibration graphs. The perceptual knowledge of the beat phenomenon is usually used to knock two tuning forks with similar frequencies to allow students to listen to changes in the strength of the sound, and experience the changes in the amplitude of the synthetic vibration. This demonstration experiment is relatively simple and visual, but it is rough. Recently, we designed and produced the “film formation demonstration instrument” (hereinafter referred to as “beating instrument ”), the teaching effect is ideal. Brief introduction