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中學物理課的無線電部分,需要‘電之共振’實驗,但一般的實驗仪器過於簡單,效果很低。如共振來頓瓶,操作困難並且共振火花極其微弱,不便演示;而使用毫安計指示的諧 振电路则线路又过於繁複,也不好作为最初的实验。我校物理组在讲授无线电基本知识时,使用了一种效果较好的演示实验装置,能很明显的指出无线电波的确可以在空间传递,实验埸所不需要很大(在两立方米的空间就可以进行),发射和接收作用可以在讲桌上同时表现出来,因而能够树立最初的关於‘电波’的概念;另外,因为该线路是仿波波夫的原始线路组成的,在讲课时可以同时提及无线电的发明人波波夫和他的雷电报知器。这里,我们愿意把该实验按照我们的设计整理出来,提供教学参考和共同研究改進。
The radio section of high school physics class requires ’electrical resonance’ experiments, but the general experimental apparatus is too simple and ineffective. Such as the resonance to Dayton bottles, difficult to operate and the resonance spark is extremely weak, inconvenient presentation; and the use of milliampere resonant circuit instructions are too complicated lines, not as good as the initial experiment. The Physics Department of our school used a good demonstration experiment device when teaching radio basic knowledge. It is clear that the radio waves can indeed be transmitted in space without the need of large experiments (in two cubic meters of space Can be done), the transmitting and receiving effects can be demonstrated simultaneously on the lecture table, so that the initial concept of ’radio waves’ can be established. In addition, since this circuit is composed of the original lines of Fobo Popov, Popov, the inventor of the radio, and his lightning detector were also mentioned. Here, we are willing to organize the experiment according to our design, to provide teaching reference and joint research to improve.