在等光子数条件下比较不同波长入射光的光电效应  

Comparing among different wavelengths of incident light in the experiment of photoelectric effect under the condition of equal photon number

作　　者：倪牟翠[1] 王志军[1] 王连元[1] 

机构地区：[1]吉林大学物理学院,吉林长春130012

出　　处：《大学物理》2015年第7期30-32,共3页College Physics

摘　　要：在光电效应实验中,测量了在等光子数条件下不同波长入射光产生的饱和光电流与光波长的关系.实验结果表明,当采用使单位时间入射到光电管单位面积上的光子数相同的条件时,饱和光电流随入射光波长的增加近似单调地减小,且反应了阴极材料的光电效率.从光的量子特性出发,理论上推导了实现等光子数条件的理由和方法,所得公式与测量结果一致.The wavelength dependence of saturation photocurrents in the experiment of photoelectric effect is investigated under the condition of equal photo number. Our results indicate that the saturation photocurrents are determined almost only by the wavelength of incident light and represent the photoelectric efficiency of cathode material. The theoretical formula of achieving the condition of equal photon number is derived on the base of the quantum nature of light,which is in agreement with the experimental results.

关 键 词：光电效应 饱和光电流 光子数 光强 光电效率 

分 类 号：O431.2[机械工程—光学工程]