Home Physics Atomic and Nuclear Physics Atomic Structure A photoelectric cell is illuminated by a poi…
Physics Atomic and Nuclear Physics Atomic Structure MCQ (Single Correct)

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then-

A
Each emitted electron carries one quarter of the initial energy.
B
Number of electrons emitted is half the initial number.
C
Each emitted electron carries half the initial energy.
D
Number of electrons emitted is a quarter of the initial number.

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The correct answer is:
D

Intensity of light source is,
When distance is doubled, intensity becomes one-fourth of initial value.
As number of photoelectrons intensity, so number of photoelectrons is quarter of the initial number.

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