Heat is generated in a l0-cm-diameter spherical radioactive material whose thermal conductivity is 25 W/m · Kuniformly at a rate of 15 W/cm3 If the surface temperature of the material ismeasured tobe 120°C, the center temperature of the material during steady operation is
(a) 160°C
(b) 205°C
(c) 280°C
(d) 370°C
(e) 495°C
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