The directional absorptivity of a gray surface varieswith
Chapter 12, Problem 12.135(choose chapter or problem)
The directional absorptivity of a gray surface varieswith as follows.(a) What is the ratio of the normal absorptivity ?ntothe hemispherical emissivity of the surface?(b) Consider a plate with these surface characteris-tics on both sides in earth orbit. If the solarflux incident on one side of the plate is, what equilibrium temperaturewill the plate assume if it is oriented normal tothe suns rays? What temperature will it assumeif it is oriented at 75to the suns rays?
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