Dual Nature Of Light Question 89
Question: When an inert gas is filled in the place vacuum in a photo cell, then [MP PMT 1997]
Options:
A) Photoelectric 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 in the photocell
Show Answer
Answer:
Correct Answer: B
Solution:
In the presence of inert gas, photoelectrons emitted by the cathode ionise the gas by collision and hence the current increases.
BETA
