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  4. In the 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 the 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

NTA AbhyasNTA Abhyas 2020

Solution:

The stopping potential Vs is related to the maximum kinetic energy of the emitted electron Kmax through the relation
$K_{m a x}=eV_{s}$
$0.5eV=eV_{s}$ or $V_{s}=0.5V$