A 70-cm-diameter flat black disk is placed at the center of the ceiling a 1 m × 1 m × 1 m black box. If the temperature of the box is 620oC and the temperature of the disk is 27oC, the rate of heat transfer by radiation between the interior of the box and the disk is
(a) 2 kW
(b) 5 kW
(c) 8 kW
(d) 11 kW
(e) 14 kW
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