JEE Advanced 2014 Physics question
Parallel rays of light of intensity I = 912 W m⁻² are incident on a spherical black body kept in surroundings of temperature 300 K. Take Stefan-Boltzmann constant σ = 5.7 × 10⁻⁸ W m⁻² K⁻⁴ and assume that the energy exchange with the surroundings is only through radiation. The final steady state temperature of the black body is close to
Answer: (A)
Solution
The sphere intercepts the beam over its cross-section and exchanges radiation with the surroundings over its whole surface . Steady state: r^2r^2(T^4$
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