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Photoelectric Effect: Li Sphere Charging and Electron Emission
This lecture discusses the photoelectric effect on an isolated Li sphere with a work function of 2.49 eV, illuminated by light of frequency v = 6.33-10¹⁴ Hz. The sphere charges positively due to emitted electrons, reaching a potential V. It explains the stabilization mechanism against electron emission and calculates the maximum fraction of emitted electrons compared to the total free electrons in the sphere. The lecture also covers the threshold potential for ceasing electron emission and the calculation of the maximum number of emitted electrons at equilibrium. Various physical parameters such as Li density, molar mass, and radius are considered in the calculations.
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