光电效应现象,是赫兹于1887年在做关于电磁波实验时发现的,1905年爱因斯坦用光量子理论成功解释了其实验规律.中学物理编入这一部分内容,目的在于引入“光子”概念,为说明光具有粒子性提供重要依据,但限于中学物理知识水平,没有也不可能详细阐述其产生机理,即使在普通物理中也是如此.因而在教学中产生了一系列模糊乃至错误认识.其中最为典型的有如下两个问题. The photoelectric effect phenomenon was discovered by Hertz in 1887 when he was doing electromagnetic experiments. In 1905 Einstein successfully explained the experimental laws by using light quantum theory. The middle school physics has incorporated this part of the content. The purpose is to introduce the concept of “photons”. The explanation is that light has the character of providing important basis, but it is limited to the level of physics in middle school, and it is neither possible nor possible to explain the mechanism of its production in detail, even in ordinary physics. As a result, a series of vague and even wrong understandings have been produced in teaching. There are the following two issues.