A flat-bottomed hole 6 mm in diameter is bored to a depth
Chapter , Problem 13.43(choose chapter or problem)
A flat-bottomed hole 6 mm in diameter is bored to a depth of 24 mm in a diffuse, gray material having an emissivity of 0.8 and a uniform temperature of 1000 K. (a) Determine the radiant power leaving the opening of the cavity. (b) The effective emissivity e of a cavity is defined as the ratio of the radiant power leaving the cavity to that from a blackbody having the area of the cavity opening and a temperature of the inner surfaces of the cavity. Calculate the effective emissivity of the cavity described above. (c) If the depth of the hole were increased, would e increase or decrease? What is the limit of e as the depth increases?
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