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  4. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

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Q. Light of frequency $1.5$ times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

NTA AbhyasNTA Abhyas 2020

Solution:

$v_{1}=1.5v_{0}$
$v_{2}=\frac{v_{1}}{2}=0.75v_{0} < v_{0}$
$\Rightarrow $ photoelectric effect (P.E.E.) not possible.