A 0.01 m diameter sphere containing radioactive waste is to be maintained under deep water. The water temperature is 20°C. To avoid boiling on the surface, it is found that the average surface...

A 0.01 m diameter sphere containing radioactive waste is to be maintained under deep water. The water temperature is 20°C. To avoid boiling on the surface, it is found that the average surface temperature of the sphere must not exceed 120°C.

 a. Calculate the total radioactive decay heat rate that the sphere can contain.

 b. Repeat the preceding calculations, this time assuming that the container is replaced with a cube with the same total volume.