正确确定遏止电压 测量普朗克常数

普朗克常数的测定通常采用光电效应的方法，其中用目测确定遏止电压和手工画出直线等手段造成的误差会限制实验的准确度。用多媒体著作工具Ｍｕｌｔｉｍｅｄｉａ ＴｏｏｌＢｏｏｋ制作的软件，能正确确定遏止电压，计算普朗克常数ｈ，消除辽两方面造在的误差。软件根据实验数据量多，采用共享式数据可填域，根据输入的实验数据画出相应滤色片的Ｉ－Ｕ曲线，并采用线性插值的方法确定遏止电压ＵＳ，将遏止电压值显示出来。当五个滤色

Determining Cut-off Voltage Properly and Measuring Planck Constant

We use the experiment of photoelectric effect to measure the Planck constant In the method we determine the cut-off voltage by our eyes and make the straight line by our hands, so the accuracy of the experiment is limited A multimedia software that is adopted by Multimedia ToolBook can draw conveniently curve of a filter The software that adopts the Method of Inserting Linear Value can determine the check volt The five filters can share the fields that can be written by users After a user has input the data of five filters the five showing fields show the cut-off voltages Addition to the software that is adopted Least Square Method can read data of the showing fields, and draw a straight line, and determine Planck constant and put it into other showing field