Two properties which a substance should possess to be used as a thermionic emitter.

High Work Function And High Melting Point

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Low Work Function And Low Melting Point

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Low Work Function And High Melting Point

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High Work Function And Low Melting Point

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Solution

The correct option is C
Low Work Function And High Melting Point

A substance used as a thermionic emitter should have

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Why is Tungsten metal not used as a Thermionic emitter? How is it modified to be a good Thermion emitter?

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