Thermal Properties of Matter

JEE Main level, single correct, medium

125 of 126

Question 125 of 126

Two spheres of the same material have radii 1 m1 \mathrm{~m} and 4 m4 \mathrm{~m} and temperatures 4000 K4000 \mathrm{~K} and 2000 K2000 \mathrm{~K} respectively. The ratio of the energy radiated per second by the first sphere to that by the second is

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Answer: (A) 1 : 1

Energy radiated αR2T4\alpha R^2 T^4

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