Heat is generated in a 3-cm-diameter spherical radioactive material uniformly at a rate of 15 W/cm3.Heat is dissipated to the surrounding medium at 25°C with a heat transfer coefficient of 120 W/m2 · K,The surface temperature of the material in steady operation is
(a) 56°C
(b) 84°C ,
(c) 494°C
(d) 650°C
(e) I08°C
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