A small circular surface of area A1 =2 cm2 located at the center of a 2-m-diameter sphere emits radiation as a blackbody at T1 = 1000 K. Determine the rate at which radiation energy is streaming through a D2 = l-cm-diameter hole located (a) on top of the sphere directly above A1 and (b) on the side of sphere such that the line that connects the centers of A1 and A2 makes 45° with surface A1.
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