Parallel rays of light of intensity I = 912 Wm –2 are incident on a spherical balck body kept in surroundings of temperature 300 K. Take Stefan-Biltzmann constant σ = 5.7 × 10 –8 Wm –2 K –4 and assume that the energy exchange with the surroundings is only through radiation. Th final steady state temperature of the black body is close to:
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Rate of radiation energy lost by the sphere
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