1. Tardigrade
  2. Question
  3. Physics
  4. A monochromatic point source of light is placed at a distance d from a metal surface. Photo electrons are ejected at a rate n per second, and with maximum kinetic energy E. If the source is brought nearer to distance d / 2, the rate and the maximum kinetic energy per photoelectron become nearly

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Q. A monochromatic point source of light is placed at a distance $d$ from a metal surface. Photo electrons are ejected at a rate $n$ per second, and with maximum kinetic energy $E$. If the source is brought nearer to distance $d / 2$, the rate and the maximum kinetic energy per photoelectron become nearly

Dual Nature of Radiation and Matter

Solution:

Intensity $\propto \frac{1}{d^{2}}$
So when the source of light is brought closer
Intensity becomes $4$ times.
Hence, rate $\propto$ Intensity the rate will become $4 n$.
$KE _{\max }$ depends on incident frequency which does not change and will remain $E .$