آزمایش اثر فوتوالکتریسیته(Photoelectric effect)
Model 2-3
Modern Experiments
هدف آزمایش:
انجام آزمایش فتوالکتریسته ، مشاهده کوانتمی بودن انرژی فوتون و تعیین ثابت h پلانک
وسایل آزمایش:
دستگاه آزمایش فتوالکتریسته ، لامپ جیوه پرفشار ، منبع تغذیه لامپ جیوه ، پایه ساده ، سیستم الکترونیک فتوالکتریسیته ، سیم رابط BNC
:Descriptions
A compact arrangement is used to determine h, in which the light from a high-pressure mercury vapor lamp is spectrally dispersed in a direct-vision prism. The light of precisely one spectral line at a time falls on the cathode. A capacitor is connected between the cathode and the anode of the photocell which is charged by the anode current, thus generating the opposing voltage U. As soon as the opposing voltage reaches the value –U۰ , the anode current is zero and the charging of the capacitor is finished. U۰ is measured without applying a current by means of an electrometer amplifier
