09 - Chapter 12 9/8/09 Blackbody radiation: radiation that...

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Unformatted text preview: Chapter 12 9/8/09 Blackbody radiation: radiation that originates exclusively from the thermal energy of an object. Heating solids produced certain colors of light. At temperature of heating increased, glowing color of solid would change: red blue/yellow white c= (lamba)(nu) Einstein photoelectric effect ; elecron is emitted when struck by a photon with sufficient energy energy of a photon is quantized E=hv (h=Plancks constant 6.626x10^-34 Js) Light can only be transferred as packets of energy size hv . Electrons thought as stream of particles *Einstein was not speaking of Newtonian model of light photoelectric effect is caused by photon absorption by the material Photoelectric effect minimum frequency required to produce an light wave effect deBroglie: Lambda = h/ p = h/mv Einstein: momentum of a photon is give by p = E/c deBroglie realized that if an electron behaves like a standing wave wavelength must equal circumference of its orbit 2(pi)r=n(lambda) Hydrogen shows 4 emission lines in the visible range Balmer showed that hydrogen emission wavelengths were predictable 1/(lamba)= 1.097x10^7 m^-1 (1/z1/(lamba)= 1....
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This note was uploaded on 09/19/2011 for the course CHEM 43L taught by Professor Therien during the Fall '09 term at Duke.

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09 - Chapter 12 9/8/09 Blackbody radiation: radiation that...

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