- Apr 2022
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p.cygnus.cc.kuleuven.be p.cygnus.cc.kuleuven.be
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d.Had Popper ever asked a Newtonian scientist under \\,hatexperimental conditions lie \f.ould abandon Neu,tonia~ltheory, some N e wtonian scientists \vould have bee11 exactly as nonplussed as are someMarxists.
"Planck was the archetype of the classical mind, a noble product of his time and culture. Throughout his distinguished career as a physicist and statesman of science, he maintained that the ultimate goal of science was a unified world picture built on absolute and universal laws of science. He firmly believed that such laws existed and that they reflected the inner mechanisms of nature, an objective reality where human thoughts and passions had no place. The second law of thermodynamics was always his favourite example of how a law of physics could be progressively freed from anthropomorphic associations and turned into a purely objective and universal law". "That Planck did not see his theory as a drastic departure from classical physics is also illustrated by his strange silence: between 1901 and 1906 he did not publish anything at all on black-body radiation or quantum theory. Only in about 1908, to a large extent influenced by the penetrating analysis of the Dutch physicist Hendrik Lorentz, did Planck convert to the view that the quantum of action represents an irreducible phenomenon beyond the understanding of classical physics."
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- Jan 2022
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chemistry.stackexchange.com chemistry.stackexchange.com
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The second operator K^jK^j\op{K}_{j} has no simple physical interpretation, but it can be shown to arise entirely due to anti-symmetry requirement, i.e. if instead of a Slater determinant one uses a simple product of spin orbitals, termed the Hartree product, there will be no K^jK^j\op{K}_{j} terms in the resulting equations (the so-called Hartree equations). It is for that reason that K^jK^j\op{K}_{j} is called the exchange operator
Brilliant explanation
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- Nov 2020
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chem.libretexts.org chem.libretexts.org
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3-47
Shouldn't this be eq 3.9.11?
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