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Assuming the sun to have a spherical out...

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 distance R from the centre of the Sun is:-
Where `sigma` is the Stefan's Constant.

A

`(r^(2)sigma(t+273)^(4))/(R^(2))`

B

`(4pir^(2)sigmat^(4))/(R^(2))`

C

`(r^(2)sigma(t+273)^(4))/(4piR^(2))`

D

`(16pir^(2)sigmat^(4))/(R^(2))`

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