A body whose surface area is 0.5 m2, emissivity is 0.8, and temperature is 200°C is placed in a large, evacuated chamber whose walls are at 25°C. What is the rate at which radiation is emitted by the surface, in W? What is the net rate at which radiation is exchanged between the surface and the chamber walls, in W?

Explanation:

Given

Surface area

emissivity

Temperature of body

Temperature of walls

Rate of radiation by surface is given by

(b)Net rate of radiation exchanged between the surface and the chamber

a

explanation:

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