Question

The photocurrent in an experiment on photoelectric effect increases if

• A. the intensity of the source is increased.
• B. the exposure time is increased.
• C. the intensity of the source is decreased.
• D. the exposure time is decreased.

Answer 1

The correct option is A the intensity of the source is increased.

Photo current increases if intensity of source is increased, as no. of emitted electrons increase.

Increasing the intensity while keeping frequency fixed, increases the number of photons hitting the metal and hence, it increases the rate at which electrons are emitted. So, the photocurrent increases.