Unformatted text preview: e is the emissivity of the material ( 0 ≤ e ≤ 1 ) and 4 2 8 10 672 . 5 − − − × = K Wm . Absorption: Here electromagnetic radiation is absorbed by a surface and the absorptivity, a , of a material is the ratio of the thermal energy absorbed by the surface to the total thermal energy incident upon it . One can prove (using thermodynamic arguments) that a e = . The emissivity of a material is equal to its absorptivity (also verified experimentally). Random Motion EM Radiation StefanBoltzmann Constant Kirchhoff’s Theorem Intensity of radiation as a function of T!...
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 Spring '07
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 Physics, Thermodynamics, Charge, Energy, Light, Radiation, Black body

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