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Question

Photoelectric effect is the phenomenon in which
  1. photons come out of a metal when it is hit by a beam of electrons
  2. photons come out of the nucleus of an atom under the action of an electric field
  3. electrons come out of metal with a constant velocity depending on frequency and intensity of incident light
  4. electrons come out of a metal with different velocity not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.

A
electrons come out of metal with a constant velocity depending on frequency and intensity of incident light
B
electrons come out of a metal with different velocity not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.
C
photons come out of the nucleus of an atom under the action of an electric field
D
photons come out of a metal when it is hit by a beam of electrons
Solution
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Electrons come out of a metal with different velocity not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.

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