Question

The photo current 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

Answer:

(c) the intensity of the source is decreased

Answer 2

The photo current in an experiment on photoelectric effect increases if  the intensity of the source is increased.

Explanation:

Option (a) is correct.

• The photocurrent in a photoelectric effect experiment increases if the source intensity is increased
• The sum of photons released from the source decreases as the light intensity decreases.
• As a response, a significant number of metal electrons interact with these photons, which thereby increase the sum of electrons released from the metal.
• Therefore the photocurrent in a photoelectric effect experiment rises. The photocurrent does't depend on the time of exposure. Therefore option (a) is right.

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