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Question

Light of particular frequency v is incident on a metal surface. When the intensity of incident radiation is increased, the photoelectric current
  1. Sometimes increases and sometimes decreases
  2. Decreases
  3. Increases
  4. Remains unchanged

A
Increases
B
Decreases
C
Sometimes increases and sometimes decreases
D
Remains unchanged
Solution
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Intensity of light No. of photons striking the metal per unit time
No. of photons striking the metal Electrons knocked out of metal per unit time.
Current = Charge/time
More the electrons knocked out per unit time, more is the photo electric current.

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