Questions
A body coated black at 600Ksurrounded by atmosphere at 300K has cooling rate the same body at 900K surrounded by the same atmosphere will have cooling rate
detailed solution
Correct option is C
Stefan's law is E=σT4-T4s, here E is energy radiated by a black body, σ is stefan's constant,T is temperature of the body for given temperature T1,T2 E1E2=T14-Ts4T24-Ts4 substitute the given temperature and cooling rate E1=r0 in the above equationr0E2=6004-30049004-3004⇒r0E2=64-3494-34=1296-816561-81=12156480=316 E2=16r03Similar 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
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