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in Properties of Bulk Matter by (79.0k points)
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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

(a) σr2T4/R2

(b) σr2T4/4πR2

(c)  σr2T4/R4

(d) 4πσr2T4/R2

(where σ is Stefan's constant) 

1 Answer

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Best answer

Correct option (a) σr2T4/R2

Explanation:

According to the Stefan Boltzmann law, the power radiated by the star whose outer surface radiates as a black body at temperature T K is given by

P = σ4πr2T4

where, r = radius of the star

σ = Stefan's constant

The radiant power per unit area received at a distance R from the centre of a star is

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