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Black Body Radiation. Wien’s Law: Radiation depends on Temperature of radiating body T = b b = 2.989x10 -3 m deg T in deg K Sun ~ 6000 o K l sun = 2.989x10 -3 m-deg/6000 o K = 0.4x10 -6 m Earth ~ 300 o K l sun = 2.989x10 -3 m-deg/300 o K = 10x10 -6 m. visible. infrared.
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Black Body Radiation • Wien’s Law: Radiation depends on Temperature of radiating body • T = b b = 2.989x10-3 m deg T in deg K Sun ~ 6000oK lsun = 2.989x10-3 m-deg/6000oK = 0.4x10-6 m Earth ~ 300oK lsun = 2.989x10-3 m-deg/300oK = 10x10-6 m
visible infrared ultraviolet