Two concentric spheres are maintained at uniform temperatures T1 = 45ºC and T2 = 280ºC and have emissivities ε1 = 0.25 and ε2 = 0.7, respectively. If the ratio of the diameters is D1/D2 = 0.30, the net rate of radiation heat transfer between the two spheres per unit surface area of the inner sphere is
(a) 86 W/m2
(b) 1169 W/m2
(c) 1181 W/m2
(d) 2510 W/m2
(e) 3306 W/m2
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