Experiment device used for verifying experiment laws of photoelectric effect and measuring Planck constant

Abstract

The invention provides an experiment device used for verifying experiment laws of a photoelectric effect and measuring a Planck constant. The experiment device is characterized in that a monochromator and a photoelectric tube are arranged in a shading box; polarizing films are arranged in front of the photoelectric tube; the monochromator is connected with a controller, and the wave length of incident monochromatic light can be set through the controller; incident intensity can be set through an incident intensity controller; the photoelectric tube is connected with a measurement controller, and the photoelectric current of the photoelectric tube under different voltages can be measured through the measurement controller. The wave length and the intensity of the incident monochromatic light of the monochromator are set through the controller, and thus, the experiment laws of the photoelectric effect can be verified; an I-V curve of the photoelectric tube under the irradiation of different monochromatic light is mapped to determine a stopping voltage, and thus, the Planck constant can be worked out. According to the experiment device provided by the invention, by adopting a monochromatic source of which the wave length is continuous and adjustable, the incident intensity can be accurately controlled, the experiment laws of the photoelectric effect can be quantitatively verified, and the measurement accuracy of the Planck constant is improved. Moreover, data of students are not easy to be similar, and the I-V characteristic curve of the photoelectric tube also can be visually displayed in an oscilloscope.

Description

Technical field [0001] The invention relates to a college physics experiment device, in particular to a comprehensive experiment device for verifying the photoelectric effect experiment rule and using the photoelectric effect to determine the Planck constant. Background technique [0002] The photoelectric effect refers to the phenomenon that electrons escape from the metal surface under the irradiation of a certain frequency of light. This kind of electrons is called photoelectron. The discovery of the photoelectric effect is of great significance to the understanding of the nature of light, that is, the wave-particle duality. It provides an intuitive and clear argument for quantum theory. Planck's constant is a very important basic constant in physics. It can be easily and effectively measured through the photoelectric effect experiment. Therefore, the photoelectric effect experiment helps students learn and understand quantum theory. And with the development of science and te...

AI Technical Summary

Problems solved by technology

[0015] First, the monochromaticity of monochromatic light obtained by using color filters is not good, and there are only five kinds of monochromatic light separated by wavelength. On the one hand, it is impossible to verify and measure the frequency threshold of the photoelectric effect. When the gram constant is used, the data is relatively small, which affects the measurement accuracy, and the student data is likely to be the same

[0016] Second, the brightness of the high-pressure mercury lamp is not easy to adjust. Changing the intensity of light incident on the photocell by changing the distance between the light source and the photocell or changing the aperture size of the front end of the photocell can only be verified qualitatively but not quantitatively. The Experimental Rule of Photoelectric Effect and Intensity

[0017] Third, the color filter should be replaced constantly during the experiment, otherwise the color filter will be broken

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