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Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t°C, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is
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r²σ(t + 273)4 4πR² -
16π²rσt4 R² -
r²σ(t + 273)4 R² -
4πrσt4 R²
where σ is the Stefan’s constant.
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Correct Option: C
Power radiated by the sun at t°C
= σ(t + 273)4 4πr²
Power received by a unit surface
| = | = | ||
| 4πR² | R² |
