Question

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

• A. halved
• B. quadrupled
• C. unchanged
• D. doubled

Answer 1

Answer: (D)

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.