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Dual Nature of Radiation and Matter question

2003 · Q143
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Dual Nature of Radiation and Matter question

2003 · Q143

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then
  1. A
    each emitted electron carries one quarter of the initial energy
  2. B
    number of electrons emitted is half the initial number
  3. C
    each emitted electron carries half the initial energy
  4. D
    number of electrons emitted is a quarter of the initial number
View written solutionFree

Correct answer: D

For a light source of power P watt, the intensity at a distance d is given by

I = P4πd2{P \over {4\pi {d^2}}}4πd2P​

∴\therefore∴ Intensity ∝\propto∝ 1(distan⁡ce)2{1 \over {{{\left( {dis\tan ce} \right)}^2}}}(distance)21​

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