光电效应法测普朗克常量信院三班白潇pb05210258实验目的:1.了解光电效应的基本规律2.用光电效应方法测量普朗克常量和测定光电管的光电特性曲线实验原理:略实验内容不同波长的光下光电管的伏安特性曲线（1）UIUIUIUI-3-0.3-0.81.104.9211.5-2.1-0.2-0.71.40.15.42.512.5-1.5-0.1-0.61.70.26312.9-1.30-0.52.20.36.7513.5-1.20.1-0.42.60.47.21014.9-1.10.3-0.33.10.57.51515-10.6-0.23.619.12015.3-0.90.8-0.14.21.510.52515.5（2）UIUIUIUI-3-0.1-0.22.30.6639.4-0.90-0.12.90.76.659.7-0.80.103.40.86.91010.3-0.70.20.140.97.11510.5-0.60.50.24.517.22010.6-0.50.80.34.91.58.22510.8-0.41.20.45.329-0.31.70.55.72.59.1（3）UIUIUIUI-3-0.1-0.12.70.76.7510.9-0.9003.30.86.91011.2-0.70.10.13.70.97.21511.3-0.60.30.24.517.42011.4-0.50.60.34.81.58.62511.6-0.410.45.329.4-0.31.40.55.72.59.9-0.220.66.2310.1（4）UIUIUIUI-300.12.30.84.356.6-0.50.10.22.70.94.5106.5-0.40.20.33.114.7156.6-0.30.50.43.41.55.2206.9-0.20.90.53.625.6257-0.11.50.63.92.5601.90.74.236.2（5）UIUIUIUI-300.110.71.7102.1-0.40.10.21.111.8152.1-0.30.20.31.31.51.9202.1-0.20.40.41.432252.1-0.10.60.51.55200.80.61.672.1从图中可得各波长下的遏止电位差(拐点法)经计算可得各个波长的光对应的频率：(频率=光速/波长)由；；有。[2006-4-2314:24"/Graph9"(2453848)]LinearRegressionforData1_B:Y=A+B*XParameterValueError------------------------------------------------------------A-1.250580.25414B0.332940.03772------------------------------------------------------------RSDNP------------------------------------------------------------0.981280.0964150.00307根据公式有：即是Origin分析的：Y=A+B*X其中：X=，B=0.33294公认的普朗克常量为，误差偏大。实验中引起误差的主要因素：1.仪器本身的问题，经过很长时间的使用已经边得不是那么灵敏了；2.环境的影响，有自然光的干扰，电子逸出之后不能全部打到阳极上等；3.实验者本身读数时的误差。光的波长一定时饱和电流与光强的关系本实验中，固定饱和电流（）2．03．75．8透光率0.250.50.75[2006-4-2314:29"/Graph1"(2453848)]LinearRegressionforData1_B:Y=A+B*XParameterValueError------------------------------------------------------------A0.066670.12472B20.23094------------------------------------------------------------RSDNP------------------------------------------------------------0.99340.0816530.07319理论上饱和电流与光强成正比。本实验符合较好。从图线中可知饱和电流与光强的比值为2。
