In 12.20 and 12.25, we estimated the earthssurface
Chapter 13, Problem 13.46(choose chapter or problem)
In 12.20 and 12.25, we estimated the earthssurface temperature, assuming the earth is black. Mostof the earths surface is water, which has a hemispher-ical emissivity of ??0.96. In reality, the water sur-face is not flat but has waves and ripples.(a) Assuming the wave geometry can be closelyapproximated as two-dimensional and as shownin the schematic, determine the effective emissiv-ity of the water surface, as defined in Problem13.43, for ??3?/4.(b) Calculate and plot the effective emissivity of thewater surface, normalized by the hemisphericalemissivity of water (?eff/?) over the range ?/2??.
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