Question: A sphere with a diameter of 80 cm is held at a temperature of 250C and is radiating energy. If the intensity of the radiation

A sphere with a diameter of 80 cm is held at a temperature of 250°C and is radiating energy. If the intensity of the radiation detected at a distance of 2.0 m from the sphere's center is 102 W/m2, what is the emissivity of the sphere?

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