A sphere with diameter of 80cm is held a...

A sphere with diameter of `80cm` is held at a temperature of `250^(@)C` and is radiating en-ergy If the intensity of the radiation detected at a distance of `2.0m` from the sphere 's cnetre is `102 W//m^(2)` What is the emissivity of the shere ? .

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A sphere with diameter of `80cm` is held at a temperature of `250^(@)C` and is radiating en-ergy If the intensity of the radiation detected at a distance of `2.0m` from the sphere 's cnetre is `102 W//m^(2)` What is the emissivity of the shere ? .

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