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

1. A. r 2 (t + 273) 4 4 R 2
2. B. 16 2 r 2 t 4 R 2
3. C. r 2 (t + 273) 4 R 2
4. D. 4 r 2 t 4 R 2

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