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11. Dual nature of radiation and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
The incident photon involved in the photoelectric effect experiment.
  • ✓
    Completely disappears
  • B
    Comes out with an increased frequency
  • C
    Comes out with a decreased frequency
  • D
    Comes out without change in frequency
✓

Answer

Correct option: A.
Completely disappears
a
(a) Incident photon involved in the photoelectric effect may completely disappears or comes out with out change in frequency.

Case $I:$ When frequency of light is less than threshold frequency than no ejection of electrons takes place so, photon comes out with same frequency.

Case $II:$ When frequency of light is more than threshold frequency, then workfunction energy is consumed into the ejection of electrons and rest energy is consumed into kinetic energy of electron. So, photon completely disappears.

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