Consider an opaque horizontal plate that is well insulated on the edges and the lower surface. The plate is maintained at 500 K, has a

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Consider an opaque horizontal plate that is well insulated on the edges and the lower surface. The plate is maintained at 500 K, has a total hemispherical absorptivity of 0.51 and the following spectral emissivity function:, = = 0.4, 0.8, 0 =  < 4 m 4 m =  < 00

If the plate is subjected to an irradiation of 5600 W/m2, determine

(a) The total hemispherical emissivity

(b) The radiosity of the plate surface.

, = = 0.4, 0.8, 0 = < 4 m 4 m = < 00

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