AIPMT PRELIMS2001Physics-Photoelectric Effect
AIPMT PRELIMS 2001 Physics Intensity and Emission MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emitted per second will be:
A
Remain same
B
Four times
C
Two times
D
One-fourth
Correct Answer
Option B
Detailed Explanation
The intensity of light is inversely proportional to the square of the distance. Reducing the distance to half increases the intensity by four times, thus increasing the number of emitted electrons by four times.
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