Questions
The radiation emitted by a star A is 10000 times that of the sun. If the surface temperatures of the sun and star A are 6000 K and 2000 K, respectively, the ratio of the radii of the star A and the sun is
detailed solution
Correct option is C
According to Stefan - Boltzmann law, the energy radiated per second through the surface of area A is given by E=σAT4∴E1E2=A1A2T1T2410000=r12r22200060004r12r22=(30)4r1:r2=900:1Talk to our academic expert!
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There are two spherical balls A and B of the same material with same surface, but the diameter of A is half that of B. If A and B are heated to the same temperature and then allowed to cool, then
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