This preview shows page 1. Sign up to view the full content.
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 Kirchhoffs Theorem Intensity of radiation as a function of T!...
View Full
Document
 Spring '07
 Field
 Physics, Charge, Radiation

Click to edit the document details