Unformatted text preview: “ultraviolet catastrophe” )! Classical theory predicts an infinite energy when integrated over all wavelengths! The classical prediction for ρ T (f) consists the following two pieces: ( ) > < × = E V df f N df f T ) ( ) , ( . (energy/volume) = (number of states/volume) × (energy/state) Study energy density of EM radiation in thermal equilibrium Spherical Cavity ( i.e. oven) equilibrium Function of x only! ρ is the energy density of E and B fields within the cavity Black Body Radiation: Y(x) versus x 0.002 0.004 0.006 0.008 0.01 x = λΤ (in m K) Y(x) 0.002898 Experimental Data Classical Theory MaxwellBoltzmann Probability Distribution Number of modes of electromagnetic radiation Energy Density...
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 Spring '07
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 Physics, Energy, Radiation, Black body, Energy density, Infrared

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