The intensity of sunlight at the Earth's surface is about 1000W/m^2. The average temperature of the Earth is about 58°F. What must the emissivity of the Earth be?

1 Answer
Andrea B.
Jul 18, 2018

the same

Explanation:

to keep the temperature costant the emitted energy must be the same that the adsorbed energy . That that changes is the quality of radiation. Sunlight has a pick of light around 580 nm, while the wavelight emessed by earth is around 10000 nm according with Wien law:
#Lamba xx T = 2.9 xx 10^-3 m xx K#

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