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Q.
The light rays having photons of energy $1 \cdot 8\, eV$ are falling on a metal surface having a work function $1.2\, eV$. What is the stopping potential to be applied to stop the emitting electrons?
JIPMERJIPMER 2006Dual Nature of Radiation and Matter
Solution:
Maximum kinetic energy of photoelectron
$( KE )_{\max } = E -\phi$
$=1.8-1.2$
$=0 \cdot 6\, eV$
i.e., $e V_{0} =( KE )_{\max } $
or $e V_{0} =0.6\, eV$
$\therefore $ Stopping potential $V_{0}=0.6\, eV$.