Quantum Chemistry 1.2 - Photoelectric Effect

Short lecture on the photoelectric effect.

When ultraviolet light hits a metal surface, electrons are ejected. Classical mechanics incorrectly predicts that the kinetic energy of the eljected electrons is proportional to the intensity and independent of frequency. Einstein used a quantum hypothesis to correctly predict that the kinetic energy is independent of intensity and proportional to frequency above a threshold frequency. The work function is equal to the ionization energy of the metal electrons, with the remainder of the photon energy giving kinetic energy to the electron. The same value of Planck's constant from blackbody radiation makes these equations match with experiment.

Notes Slide: http://imgur.com/fFq9dO9.png

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