A body of area and emissivity 0.60 radiates power at 800 K

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A body of area 0.020 m20.020\,\text{m}^2 and emissivity 0.60 radiates power PP at 800 K. Its temperature is then raised by 10 % and, simultaneously, its emissivity decreases to 0.50. What is the new power emitted per unit area expressed as a multiple of PP? (a) 1.46 P1.46\,P (b) 0.92 P0.92\,P (c) 1.22 P1.22\,P (d) 1.76 P1.76\,P

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