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The threshold wavelength for photoelectric emission from a material is 5200 Å. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a
  • a)
    50 watt infrared lamp
  • b)
    1-watt infra-red lamp
  • c)
    50 watt ultraviolet lamp
  • d)
    1-watt ultraviolet lamp
Correct answer is option 'C,D'. Can you explain this answer?
Verified Answer
The threshold wavelength for photoelectric emission from a material is...
The threshold wavelength is 5200Å. For ejection of electrons, the wavelength of the light should be less than 5200 Å, so that frequency increases and hence the energy of incident photon increases. U.V light has less wavelength than 5200 Å.
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