Assuming the sun to be a spherical body of radius R at a temperature of T K, evaluate the total radiant power, incident on earth, at a distance r from the sun:Radius of earth is r0 .
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a
r02R2σT44πr2
b
R2σT4r2
c
4πr02R2σT4r2
d
πr02R2σT4r2
answer is D.
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Detailed Solution
Total radiant power =σ(4πR2)T44πr2=σR2T4r2Total radiant power incident on earth =σR2T4r2×πr02