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Gasiorovicz-3.doc

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Rajput AbdulWaheed Bhatti
Rajput AbdulWaheed Bhatti

Ultraviolet light with a wavelength of 350 nm was shone on a potassium surface, ejecting photoelectrons with a maximum kinetic energy of 1.6 eV. Using the formula that relates photon energy, work function, and kinetic energy, along with the given values, the work function of potassium was calculated to be 1.94 eV.

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1 Ultraviolet light of wavelength 350 nm falls on a potassium surface. The maximum energy of the photoelectrons is 1.6 eV. What is the work function of potassium?
2 Solution
3 We know that (1) where is the photon energy in which is the Planck's constant and is the frequency of photon, is the work function of the metal and is the kinetic energ hc h W K hc W K h h c W K ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? y of the electron leaving the metal.
4 Using 1240 . 350 1.6 in eq.(1), we get 1240 . 1.6 350 3.54 1.6 1.94 hc eV nm nm K eV eV nm W eV nm eV eV eV ? ? ? ? ? ? ? ? ?

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Gasiorovicz-3.doc

  • 1. 1 Ultraviolet light of wavelength 350 nm falls on a potassium surface. The maximum energy of the photoelectrons is 1.6 eV. What is the work function of potassium?
  • 3. 3 We know that (1) where is the photon energy in which is the Planck's constant and is the frequency of photon, is the work function of the metal and is the kinetic energ hc h W K hc W K h h c W K ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? y of the electron leaving the metal.
  • 4. 4 Using 1240 . 350 1.6 in eq.(1), we get 1240 . 1.6 350 3.54 1.6 1.94 hc eV nm nm K eV eV nm W eV nm eV eV eV ? ? ? ? ? ? ? ? ?