Home Physics Electron, Photon, Photoelectric Effect and X-rays Hard When an inert gas is filled in the place vac…
Physics Electron, Photon, Photoelectric Effect and X-rays Hard MCQ (Single Correct)

When an inert gas is filled in the place vacuum in a photocell, then

A
Photo-electric current is decreased
B
Photo-electric current is increased
C
Photo-electric current remains the same
D
Decrease or increase in photo-electric current does not depend upon the gas filled

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Verified by Experts
The correct answer is:
B

In the presence of inert gas photoelectrons emitted by cathode ionise the gas by collision and hence the current increases.

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