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Question

Assuming the sun to be aspherical body of radius R at a temperature of T K, evaluate the total radiant power incident on earth, at a distance r from the sun. Take radius of earth as Ro(R not)

Joshi sir comment

Total radiant power given by the sun = σAT⁴= 4πR²σT⁴

amount received on the surface of earth = (πR₀²/4πr²)*4πR²σT⁴

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