1.

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 radiys r, whose outer surface radiates as a black body at a temperature TK is given by

Answer»

`sigmar^(4)T^(4)//R^(4)`
`4pisigmar^(2)T^(4)//R^(2)`
`sigmar^(2)T^(4)//R^(2)`
`sigmar^(2)T^(4)//4pir^(2)`

SOLUTION :`(DE)/(A)=(sigma4pir^(2)T^(4))/(4piR^(2))=(sigmar^(2)T^(4))/(R^(2))`

Correct CHOICE is (c ).


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