The work function of tungsten coated with Barium Oxide is nearly

5 eV

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10 eV

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1 eV

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0.01 eV

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Solution

The correct option is C 1 eV
The work function of tungsten coated barium oxide is 1eV. Barium oxide helps in decreasing the work function of the tungsten cathode. These cathodes are slightly higher in temperature.

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