Questions
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
detailed solution
Correct option is C
Rate of cooling, RC=AεσT4−T04mc=AεσT4−T04VρC⇒ RC∝AV∝1r∝1( Diameter ) (∵ m=ρV)Since diameter of A is half that of B, its rate of cooling will be twice that of B.Talk to our academic expert!
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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
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