ESS55
Prof. Jin-Yi Yu
Energy Emitted from Earth
§ The Stefan-Boltzmann Law
The energy flux emitted by a blackbody
is related to the fourth power of the
body’s
absolute temperature
F = sT4 where s is 5.67x10-8 W/m2/K
§ Energy emitted from the Earth
= (blackbody emission) x (total area of
Earth)
= (sTe4 ) x
(4p R2Earth )