An oxide-coated filament is useful in vacuum | vedclass

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Question

(D) An oxide-coated filament is used in vacuum tubes because the oxide layer (typically barium or strontium oxide) significantly reduces the work func

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It can emit electrons at relatively lower temperatures

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(D) An oxide-coated filament is used in vacuum tubes because the oxide layer (typically barium or strontium oxide) significantly reduces the work function of the metal surface. Due to this lower work function,the filament can emit a large number of electrons via thermionic emission at relatively lower temperatures compared to pure metal filaments. This increases the efficiency and lifespan of the vacuum tube.

An oxide-coated filament is useful in vacuum tubes because essentially:

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