AIPMT PRELIMS 2010 Physics Radiation MCQ Question
The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by (Where σ is Stefan’s Constant)
4πσr²T⁴/R²
σr²T⁴/R²
σr²T⁴/4πr²
σr⁴T⁴/r⁴
Correct Answer
Detailed Explanation
The radiant energy per unit area is given by the Stefan-Boltzmann law, which states that the power radiated per unit area is proportional to T⁴. The correct expression is σr²T⁴/R².
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