A 70-cm-diameter flat black disk is placed at the center of the ceiling of a 1-m × 1-m × 1-m black box. If the temperature of the box is 620°C and the temperature of the disk is 27°C, 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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