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充分利用演示实验进行教学,是进行启发式教学的一个重要环节。本文谈谈我们是怎样用闪光照相做演示实验的。一提到闪光照相,人们就想到,它需要昂贵的仪器,并且必须在暗室中进行,根本不能用来做演示实验。而根据我们多次实验结果证明,遮光法做闪光照相,不仅能定性,也完全能定量;不仅能让学生做分组实验,也完全可以做课堂演示实验。我们采取的改进措施有以下几点: 一、小马达转速的测定这个问题是闪光照相能否用来做演示实验的关键性问题。我们采用的是经济、迅速、简单的闪光测频法。它是根据人眼的视觉暂留现象来测的。
Making full use of demonstration experiments is an important part of heuristic teaching. This article talks about how we did demonstration experiments with flash photography. When it comes to flash photography, one comes to mind that it requires expensive equipment and must be done in a dark room and can not be used for demonstration experiments at all. According to our many experimental results show that the light shading flash photography, not only qualitative, but also fully quantitative; not only allow students to do group experiments, but also can do the classroom demonstration experiment. We take measures to improve the following: First, the determination of small motor speed This issue is the flash photography can be used to demonstrate the key issues of the experiment. We are using the economy, rapid, simple flash frequency measurement method. It is based on the visual persistence of the human eye to measure.