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The radiant energy from the Sun incident...

The radiant energy from the Sun incident normally at the surface of earth is `20kcal//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

`160Kcal//m^(2)min.`

B

`40Kcal//m^(2)min.`

C

`320Kcal//m^(2)min.`

D

`80Kcal//m^(2)min.`

Text Solution

Verified by Experts

The correct Answer is:
C
`EpropT^(4)" "thereforeE_("new")=(2)^(4)xx20=320`
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