Measurement of Planck Constant by Photoelectric Effect Method
In the experiment to measure Planck Constant by Photoelectric Effect,the zero-current method was used to investi-gate the effect of different preheating times of the light source,different distances between the light source and the photocell,and dif-ferent directions of voltage regulation on Planck Constant.The relationship between the incident light frequency v and the cut-off voltage Us was linearly fitted using Origin software,and Planck Constant was calculated.The analysis showed that the best experi-mental conditions for measuring Planck Constant were a preheating time of 25 minutes,a distance of 0.22 meters between the light source and the phototube,and positive voltage regulation.
Planck ConstantPhotoelectric Effectthe zero-current methodcut-off voltage
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