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高中物理教材“示波管”一节中,有关扫描、示波和同步等概念学生不易理解。我们采用在已学过的知识基础上,启发学生积极思维,引导他们能动地去探求新知识,收到了较好的教学效果。具体做法如下: 1、复习带电粒子在电场中运动的规律,使学生认识示波管中电子偏转的原理。根据图1中已知条件,利用上节的知识,求出偏转距离。
The concept of scanning, oscillography and synchronization is not easily understood by students in the “oscilloscope tube” section of the high school physics textbook. Based on the knowledge we have learned, we have inspired students to think positively and guided them to actively explore new knowledge and received better teaching results. The specific approach is as follows: 1. Review the laws of movement of charged particles in the electric field, so that students understand the principle of electron deflection in the oscilloscope tube. According to the conditions known in Fig. 1, using the knowledge of the previous section, find the deflection distance.