Author(s)

Weicheng Gao

Corresponding Author

Weicheng Gao

Abstract

In this paper, the properties of light are studied by means of photoelectric effect. Einstein's theory of light quantum, which reveals that the energy of photon E = hν, is very important to study the specific heat of solid, radiation theory and atomic spectrum. The propagation of light shows its wave property, which produces interference, diffraction, polarization and other phenomena. When light interacts with objects, its corpuscular property is highlighted again. Wave particle duality is the inherent property of all micro objects, and quantum mechanics has been developed to describe and explain the motion law of micro objects, which makes a great progress in people's understanding of the objective world. Based on the photoelectric effect method, the cut-off voltages of five different frequencies of light are studied: As each frequency of light have a unique photon energy, the energy for moving that the escaping electrons got is different. The experiment shows that: The higher the frequency of photons, the higher the energy of escaping electrons, so the cut-off voltage(COV) is higher. At the same time, when the incident ray has a frequency lower than regular value, no photocurrent will be generated no matter what the intensity of light and the time of irradiation is. The volt ampere saturation(AS)characteristic curve of different frequencies and the intensity of light is further studied: different spectral lines at the same aperture and the same distance; a certain spectral line at different light intensities and the same aperture; a spectral line at different luminous flux and the same distance. These research results provide a good significance for the future optical research.

Keywords

Photoelectric effect, Light intensity, Different distances, Apertures