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Assuming the Sun to be a spherical body ...

Assuming the Sun to be a spherical body of radius R at a temperature of TK, evaluate the total radiant powered incident of Earth at a distance r from the sun
where `r_0` is the radius of the Earth and `sigma` is Stefan's constant.

A

`(4pi r_0^2 sigma T^4)/(r^2)`

B

`(pir_0^2 R^2 sigma T^4)/(r^2)`

C

`(r_0^2 R^2 sigma T^4)/(4 pi r^2)`

D

`(R^2 sigma T^4)/(r^2)`

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