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  4. The light rays having photons of energy 4.2 eV are falling on a metal surface having a work function of 2.2 eV. The stopping potential of the surface is :

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Q. The light rays having photons of energy $4.2 \,eV$ are falling on a metal surface having a work function of $2.2 \, eV$. The stopping potential of the surface is :

NEETNEET 2022Dual Nature of Radiation and Matter

Solution:

$KE = hv -\phi$
$eV V _0= h v-\phi$
$eV _0=4.2 \,eV -2.2 \,eV$
$\Rightarrow V _0=2$ Volts