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A sphere, 0.30 m in radius, has a surface emissivity of 0.48 and is at a temp

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A sphere, 0.30 m in radius, has a surface emissivity of 0.48 and is at a temp

A sphere, 0.30 m in radius, has a surface emissivity of 0.48 and is at a temperature of 600K. The sphere is surrounded by a concentric spherical shell whose inner surface has a radius of 0.90m and an emissivity of 1.00. The temperature of the shell is 400 K. The rate at which heat is radiated, including direction, in the space between the sphere and the shell, in kW, is closest to:
A)

4.0, outward
B)

8.3, outward
C)

18.8, outward
D)

6.5, inward
E)

10.8, inward

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