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Physics
Classical Physics
Mechanics
How does thermionic emission work?
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[QUOTE="sophiecentaur, post: 6007020, member: 199289"] Thermionic cathodes do not use Tungsten as a source of electrons. They are coated with a range of materials. [URL='https://en.wikipedia.org/wiki/Hot_cathode']See this wiki link [/URL]about hot cathodes. The operating temperature of many valve cathodes is less than 600°C (also mentioned in the link). Edit: What have you read up about thermionic emission? Electrons do not totally escape from a hot cathode if there is no handy positive electrode nearby. Without an external field, they hang around the surface and return to the cathode which has become positively charged. Electrons do not need 'escape velocity'. [/QUOTE]
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Mechanics
How does thermionic emission work?
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