In Davisson-Germer experiment, electron gun is coated with oxide of _______ .

Barium

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Sodium

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Potassium

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Iron

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Solution

The correct option is A Barium
The Davisson and Germer experiment consisted of Nickel crystal (target), electron gun and a detector. The electron gun consisted of tungsten filament with high and low tension batteries. The work function of uncoated tungsten filament is 4.5 eV. The coating of Barium oxide on this filament reduces its work function so that electron can be emitted at low temperature.

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