The work function of tungsten is reduced by coating it with .........

Zinc

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Boron oxide

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Barium oxide

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Magnesium oxide

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Solution

The correct option is C Barium oxide
Work function of tungsten is $4.5 e V$ . Coating of Barium oxide on tungsten reduces its work function to $1.5 e V$ . Due to this, electrons are emitted at low temperatures and thus the emission process becomes economical.

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