Authors: Eric Su
Based on conservation law of energy, Poynting vector describes the power per unit area in electromagnetic wave. The time-averaged power per unit area is independent of the wavelength and the frequency of the wave. One example is FM radio signal. In photoelectric effect, the incident light wave transfers energy to the electron. Light wave of higher frequency takes longer time to transfer more energy to the electron. The total energy absorbed by the electron is proportional to the area facing the incident light. From this area, the radius of the electron can be calculated.
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[v1] 2018-10-16 19:09:05
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