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一、课本要求: 高中《物理》下册第八章“光的本性”第八节“光电效应”对演示实验提出了四点要求: (1)紫外线照射锌板使验电器带电(图8-18),即光电效应现象。 (2)由图8-19装置,研究光电流的饱和值和入射光强度的关系。 (3)由图8-19装置,ΚA间加反向电压,研究临界反向截止电压与入射光的强度和频率的关系。 (4)对于任何一种金属,入射光的频率必须大于某一极限频率才能产生光电效应;低于这个极限频率的光,无论强度如何,照射时间多久,也不能产生光电效应。对其要求(2)(3),可用与课本图8-19类
I. Textbook Requirements: The eighth chapter of “Physics” in the book “Physics” of High School, Section VIII “Photoelectric Effect” put forward four requirements for the demonstration experiment: (1) The ultraviolet radiation on the zinc plate electrifies the electroscope (Figure 8 - 18), the photoelectric effect phenomenon. (2) From Fig. 8-19, the relationship between the saturation value of the photocurrent and the incident light intensity was studied. (3) From the device of Figure 8-19, reverse voltage is applied across ΔA to study the relationship between the critical reverse cut-off voltage and the intensity and frequency of incident light. (4) For any kind of metal, the frequency of incident light must be greater than a certain limit frequency in order to produce a photoelectric effect; light below this limit frequency, regardless of intensity, how long the irradiation time, and can not produce a photoelectric effect. For their requirements (2) (3), available with textbooks Figure 8-19