Q. When an inert gas is filled in place of vacuum in a photo cell, 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
Explanation
(b) In the presence of inert gas photoelectrons emitted by cathode ionize the gas by collision and hence the current increases
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.