The surfaces of a two-surface enclosure exchange heat with one another by thermal radiation. Surface 1 has a temperature of 400 K, an area of 0.2 m2, and a total emissivity of 0.4. Surface 2 is black, has a temperature of 800 K, and an area of 0.3 m2. If the view factor F12 is 0.3, the rate of radiation heat transfer between the two surfaces is
(a) 340 W
(b) 560 W
(c) 780W
(d) 900 W
(e) 1160 W
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