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  4. Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes

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Q. Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes

KCETKCET 2019Dual Nature of Radiation and Matter

Solution:

We know photoelectric current is directly proportional to the intensity of incident light provided incident frequency is greater than threshold frequency.
$\therefore \,$ When intensity is doubled, photoelectric saturation current doubles.