Unformatted text preview: its death. However,
quantum-mechanics 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 black-body
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, non-reflecting
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 black-body 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 Rayleigh-Jeans formula is given by I (λ )...
View Full Document
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