Stefan’s Law: P = σAeT4
σ = 5.669 x 10-8 W/m2K4
(e = 1 for blacktop)
Pin = Pout
σAineT4 = σ Aout e T4
(1000) = 5.669 x 10-8 1*1* T4
T = 364 K
At high noon, the Sun delivers 1 000 W to each square meter of a blacktop road. If the hot
asphalt transfers energy only by radiation, what is its steady-state temperature?
1 answer