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KCET2013PhysicsDual Nature of Matter

Light emitted during the de excitation of electron from n=3 to n=2 , when incident on a metal, photoelectrons are just emitted from that metal. In which of the following de excitations photoelectric effect is not possible?

Options

  1. AFrom n=2 to n=1
  2. BFrom n=3 to n=1
  3. CFrom n=5 to n=2
  4. DFrom n=4 to n=3

Correct answer

D. From n=4 to n=3

Step-by-step solution

The photoelectric effect is possible when light of sufficient energy incident on metal surface. When electron de excites form n=3 to n=2 , the light produces photoelectric effect. So for the given options, the photoelectric effect is not possible for that level in which energy of emitted light is less than that for n=3 to n=2 . (h v)_ 4-3 < (h v)_ 3-2 Hence, photoelectric effect is not possible.

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