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The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by:
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σr²T4 R² -
σr²T4 4πr² -
σr4T4 r4 -
4πσr²T4 R²
(where is Stefan's constant)
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Correct Option: A
| E = | σ T4 = | σ T4 | ||
| S0 | 4πR² |
| = σ | T4 | |
| R² |
