Question: 1 2 . 5 8 A small disk 4 mm in diameter is positioned at the center of an isothermal, hemispherical enclosure. The disk is

12.58 A small disk 4 mm in diameter is positioned at the center of an isothermal, hemispherical enclosure. The disk is diffuse and gray with an emissivity of 0.8 and is maintained at 1000 K. The hemispherical enclosure, maintained at 300 K, has a radius of 100 mm and an emissivity of 0.85.

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