外光电法测量普朗克常量的误差分析与修正

Error analysis and correction of the Planck constant measured by external photoelectric effect

光电效应实验测量得到的普朗克常量与公认普朗克常量值之间存在较大误差,本文通过一系列实验和数据分析,证明了光电效应实验中截止电压对应的光波长并不是滤色片标称的波长,而是小于滤色片标称的波长,是与光电管灵敏度相关的某一起始波长,即起始波长标称不准是误差的主要因素,并设计了相应的改进方案.

The error on the measured value of Planck constant by photoelectric effect was usually quite large. Based on a series of experiments and data analysis in the photoelectric effect experiment, the wavelength corresponding to the Cut-off voltage was observed to be shorter than the nominal wave- length of the optical filter and relevant to the sensitivity of the phototube. An improved plan was thus designed.