The unit of Stefa’s constant is
watt/m2 K4
watt/m3 K
watt/m2 K
watt/m3 K4
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The solar constant for the earth is about 1.8 J/m2/S. what is the solar constant for a black body situated on a planet which is situated at a distance of 0.3 times the distance of the earth from the sun?