The directional absorptivity of a gray surface varies with

Chapter , Problem 12.135

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The directional absorptivity of a gray surface varies with as follows. (a) What is the ratio of the normal absorptivity n to the hemispherical emissivity of the surface? (b) Consider a plate with these surface characteristics on both sides in earth orbit. If the solar flux incident on one side of the plate is , what equilibrium temperature will the plate assume if it is oriented normal to the suns rays? What temperature will it assume if it is oriented at 75 to the suns rays?

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