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The radiant energy from the sun, inciden...

The radiant energy from the sun, incident normally at the surface of earth is `20 kcal//m^(2)` min. what would have been the radiant energy, incident normally on the earth, if the sun had a temperature, twice of the present one ?

A

`320 kcal//m^(2) min`

B

`40 kcal//m^(2) min`

C

`160 kcal//m^(2) min`

D

`80 kcal//m^(2) min`

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