L2 - Unexplained experimental observations at the beginning...

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Unexplained experimental observations at the beginning of the 20th century Blackbody radiation: Planck constant and Plank distribution law for blackbody radiation Photoelectric effect: threshold frequency Hydrogen atom spectrum: Rydberg series
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Quantum Theory: Blackbody Radiation A black body : absorbs all electromagnetic radiation ! black! A black body emits all frequencies and its spectrum does depend on temperature T ! =c / " :
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Quantum Theory: Blackbody Radiation Blackbody Radiation : The spectrum of blackbody radiation is solely determined by its temperature. Failure of classical theory:
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Max Planck (1858-1947) Quantum Theory: Blackbody Radiation Max Planck, 1900: Energy, like matter, is discontinuous. ! = nh ! Planck’s constant: n: positive integer Energy associated with radiation at frequency ! : Photon (energy quanta): h !
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A bound electron in a metal may absorb an incoming photon. If the energy of the absorbed photon is larger than the electron binding energy, # (known as the metal work function ), the electron is ejected from the metal. discovered in 1888 by Heinrich Hertz
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This note was uploaded on 02/06/2011 for the course CHE 110A taught by Professor Mccurdy during the Fall '09 term at UC Davis.

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L2 - Unexplained experimental observations at the beginning...

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