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What is Thermionic Emission?Thermionic Emission DefinitionThermionic emission is the release of electrons from a heated material due to thermal energy overcoming the work function of the material.Work FunctionThe work function is the minimum energy needed to release an electron from a material, varying across different substances.MeasurementThermionic emission is measured using thermionic current, which can be calculated with the Richardson-Dushman equation. J is the thermionic current density (