Unformatted text preview: its death. However,
quantummechanics shows, that physical processes are not predetermined in a mathematically
exact sense. As will be seen later, the determinism inherent to newtonian mechanics is in conflict
with with quantum mechanics.
Quantum mechanical principles were first postulated by Planck to explain the blackbody
radiation. At the end of the 19th century, scientists tried to explain the intensity spectrum of a
black body with temperature T. A black body is defined as a perfectly absorbing, nonreflecting
body. The intensity spectrum I(λ) (in Watts per unit area and per unit wavelength) was
experimentally found to be the same for all black bodies at the same temperature, as predicted by
arguments based on thermodynamics. The spectral intensity of blackbody radiation as a function
of wavelength is shown in Fig. 1.2 for different temperatures.
Rayleigh and Jeans predicted a law based on laws of mechanics, electromagnetic theory and
statistical thermodynamics. The RayleighJeans formula is given by I (λ )...
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This note was uploaded on 02/05/2013 for the course CHEM 131A taught by Professor Rentzepis during the Fall '12 term at UC Irvine.
 Fall '12
 Rentzepis

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