What is Electron Emission?Electron Emission DefinitionElectron emission is the release of electrons from a material’s surface when they gain enough energy to overcome the surface barrier.Types of Electron EmissionThe main types are thermionic emission (heat), field emission (electric field), photoelectric emission (light), and secondary electron emission (high-energy particles).Work FunctionThe work function is the minimum energy needed for electrons to escape a material’s surface.Applications i