A thermodynamics argument based on the blackbody radiation can be used to show that the determinant of a RTM is the ratio of the indices of refraction:
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This manifests itself in some different ways, such as the sea of electrons model of metallic bonding, or more universally, in the continuous spectrum of blackbody radiation.
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Page proposed an emission theory that successfully explained blackbody radiation and other phenomena in electrodynamic terms, but was eventually abandoned in favor of later theories of quantum mechanics.
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At this point, the gas becomes nearly an ideal " greybody radiator . " Even higher current densities will produce blackbody radiation, centering the output in the ultraviolet.
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Compared to blackbody radiation, laser emission has high directionality ( small solid angle ? " ? " ) and spectral purity ( narrow bands ? " ? " ).
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The link with the laws of thermodynamics was further strengthened by Hawking's discovery that quantum field theory predicts that a black hole radiates blackbody radiation at a constant temperature.
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A blackhole emits very little Blackbody radiation-- as someone pointed out, Hawking radiation is weaker than CMB . be free ) 23 : 49, 7 November 2011 ( UTC)
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Most of the time when blackbody radiation is created by a physical object you see an imprint of the molecular structure of the physical object on the resulting radiation.
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The result is that the emission spectrum does not fit the spectral distribution of a blackbody radiation, but it depends only on those collisional processes which occur in a very rarefied plasma.
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If I had a device that was perfectly insulated and lost heat only via blackbody radiation and I put it in the sun and let it reach equilibrium, what temperature would it reach?
