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Heat is generated in an 8 cm diameter spherical radioactive material whose thermal conductivity is 25 W/mK uniformly at a rate of 15 W/ cm3

Heat is generated in an 8 cm diameter spherical radioactive material whose thermal conductivity is 25 W/mK uniformly at a rate of 15 W/ cm3 . If the surface temperature of the material is measured to be 120 C, the center temperature of the material during steady operation is

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