Q. When a monochromatic point source of light is at a distance of 0.2 m from a photocell, the cut-off voltage and the saturation current are respectively $V_{0} = 0.6V\ $ and $I_{s} = 18.0mA.$ If the same source is placed o.6 m away from the photocell, then
A) Stopping potential $V_{0} = 0.2$ V and saturation current $I_{s} = 18.0mA$
B) Stopping potential is $0V_{0} = 0.6V\ $and saturation current $I_{s} = 18.0mA\ $
C) Stopping potential $V_{0} = 0.6\ $V and saturation current $I_{S} = 2.0\ mA$
D) Stopping potential $V_{0} = 2.0$ V and saturation current $I_{S} = 2.0mA$
Explanation
The correct answer is Option C: Stopping potential $V_{0} = 0.6\ $V and saturation current $I_{S} = 2.0\ mA$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.