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The radiant energy from the sun, incident normally at the surface of earth is 20 k cal/m² min. What would have been the radiant energy, incident normally on the earth, if the sun had a temperature, twice of the present one?
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- 160 k cal/m² min
- 40 k cal/m² min
- 320k cal/m² min
- 80 k cal/m² min
Correct Option: C
According to Stefan’s law E ∝ T4
| = | Or, | = | ||||||
| E2 | T24 | E2 | 24T4 |
E2 = 320 kcal/m². min.
