An object of surface area is maintained at

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

An object of surface area 0.02 m20.02\,\text{m}^2 is maintained at 500 K500\,\text{K}. If its emissivity is 0.400.40, calculate the rate at which it radiates energy. Also find the rate of energy radiation from a perfect blackbody of the same area at the same temperature. Use σ=5.67×10−8 W m−2K−4\sigma = 5.67\times 10^{-8}\,\text{W m}^{-2}\text{K}^{-4}.

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