A photoelectric cell is illuminated by a point source of light $1 \mathrm{~m}$ away. When the source is…

A photoelectric cell is illuminated by a point source of light $1 \mathrm{~m}$ away. When the source is shifted to $2 \mathrm{~m}$ then:
  1. each emitted electron carries one quarter of the initial energy
  2. number of electrons emitted in half the initial number
  3. each emitted electron carries half the initial energy
  4. number of electrons emitted is a quarter of the initial number

Solution

For a point source $\mathrm{I} \propto \frac{1}{r^2}$

Asked in: NEET 2003

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