PHY3063 R. D. Field Department of Physics Chapter3_8.doc University of Florida “Action” variableBlack-Body “Action” We have not discovered Planck’s constant yet. Nevertheless it is interesting to see how the “natural action” of the “Black-Body” radiation compares with Planck’s constant. If we define xa= (kT) × (λ/c) = kx/c, then xahas dimensions of “action”. Now we plot 5)()(TzYTλρ=, with hckThckxhxzaλ===, where his Planck’s constant. The data again lie on a universal curvewith Ymaxoccurring at zmax= 0.2014 = xa/h, We see that the “natural” action for “Black-Body” radiation can be smaller
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