Name a substance that is a good thermionic emitter.
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Solution
Thermionic emitter:
Whenever a filament is warmed to a certain level, electrons obtain thermal energy, which disrupts the electron-nucleus contact. As a result, electrons are emitted from the base of the filaments. The filament is also known as a thermion emitter.
Thermion emitters should have a moderate melting temperature to avoid melting however at high temperatures.
The thermion emitter's activity function should be reduced so that less heat energy is needed to release electrons from its surface.