When an inert gas is filled in the place of vacuum in a photo cell, then

Photo-electric current is decreased

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Photo-electric current is increased

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Photo-electric current remains the same

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Decrease or increase in photo-electric current does not depend upon the gas filled

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Solution

The correct option is B Photo-electric current is increased
In the presence of inert gas photoelectrons emitted by cathode ionise the gas by collision and hence the current increases.

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