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  4. In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

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Q. In photoelectric emission process from a metal of work function $1.8\, eV$, the kinetic energy of most energetic electrons is $0.5\, eV$. The corresponding stopping potential is

AIPMTAIPMT 2011Dual Nature of Radiation and Matter

Solution:

The stopping potential $V_{s}$ is related to the maximum kinetic energy of the emitted electrons $K_{\max }$ through the relation
$K_{\max }=e V_{s} $
$0.5 eV =e V_{s} $
or $ V_{s}=0.5 V$