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Q. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

NEETNEET 2020Dual Nature of Radiation and Matter

Solution:

$K_{1}=1.5 \,hv_{0}-\phi_{0}=0.5\,hv_{0}$
$K_{2}=\frac{1.5}{2}hv_{0}-hv_{0}=-0.25\,hv_{0}$
$\because$ Kinetic energy can never be negative, so no emission and $i=0$