As the excess energy will be in the form of kinetic energy is calculated by the photoelectron spectrometer it is possible to calculate ionization energy of a molecule by rearranging the following equation. The energy of the photon and the KE of the electron. E electron denotes the kinetic energy of the photoelectron which is equal to ½m e v 2 m e mass of electron 9110-31 kg If the energy of the photon is less than the threshold energy there will be no emission of photoelectrons since the attractive forces between the nuclei and the electrons cannot be overcome.
If you substitute 0 for m because a photon is massless and E hv the formula for the energy of a photon you get hvpc.
For the example the electrons maximum kinetic energy is. Equations Einstein and Millikan described the photoelectric effect using a formula in contemporary notation that relates the maximum kinetic energy Kmax of the photoelectrons to the frequency of the absorbed photons f and the threshold frequency f0 of the photoemissive surface. Learn how to interpret a photoelectron spectrum and relate it to the electron configuration of an element. The maximum kinetic energy of photoelectron ejected is given by KE.