Wien's Distribution Law

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Wien's Distribution Law, stated 1896, was named after its originator, German physicist Wilhelm Wien (1864-1928).

Let Image:Wien's4.gif‎ be the equilibrium energy per unit volume, in the wavelength range Image:Wien's2.gif to Image:Wien's1.gif, in an emptied cavity with opaque, thick walls at a temperature T. Subsequently,

Image:Wien's3.gif

where C is a constant and f is a universal function of Image:Wien's2.gif and T. For lengthy wavelengths, an imprecise model of Wien’s Distribution Law, labeled Wien’s formula, is

Image:Wien's_Formula.gif

In Wien’s formula above, A and B are both constants.