Assuming the sun to have a spherical outer surfaceof radius r - radiating like a black body at temperature t°C - the power received by a unit surface - (normal to theincident rays) at a distance R from the centre of the sunis [2007]

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Assuming the sun to have a spherical outer surfaceof radius r - radiating like a black body at temperature t°C - the power received by a unit surface - (normal to theincident rays) at a distance R from the centre of the sunis [2007]