JEE (Advanced) 2014 Paper-2 Question 6

Question 6

Parallel rays of light of intensity $$I = 912 Wm^{-2}$$ are incident on a spherical black body kept in surroundings of temperature 300 K. Take Stefan-Boltzmann constant $$\sigma = 5.7 \times 10^{-8} Wm^{-2} K^{-4}$$ and assume that the energy exchange with the surroundingsis only through radiation. The final steady state temperature of the black body is close to

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