NEET 2007 Physics question
Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature , the power received by a unit surface, (normal to the incident rays) at a distance R from the center of the sun is (where is the Stefan's constant).
Answer: (1)
Solution
By Stefan's law the power radiated by the sun (the temperature must be in kelvin, ). This power spreads uniformly over a sphere of radius , whose area is . Power received per unit area
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