Thermionic emissions are related to the

conduction

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convection

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radiation

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none of these

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Solution

The correct option is C convection
Thermionic emissions occur in metal and can be defined as the emission of electrons that transport current on heating.
It depends on the heat applied and the work function of the metal.
Hence, Thermionic emissions are related to convection.
So, the correct option is $(A)$

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