Heat TransferHard
Question
The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the the centre of a star of radius r, whose outer surface radiated as a black body at a temperature T K is given by
(where σ is Stefan′s constant)
(where σ is Stefan′s constant)
Options
A.
B.
C.
D.
Solution
According to the Stefan′s Boltzmann law, the power radiated by the star whose outer surface radiated 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 recived at distance R from the centre of star is
P = σ4πr2T4
where,
r = radius of the star
σ= Stefan’s constant
The radiant power per unit area recived at distance R from the centre of star is
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