A) 1230 J
B) 2225 J
C) 2115 J
D) 2315 J
Correct Answer: B
Solution :
From Stefans law of radiation, the energy radiated (E) is given by \[E=e\,\sigma {{T}^{4}}A\,t\] Given, \[e=0.85,\,\,\,\sigma =5.7\times {{10}^{-8}}\], T = 2000 K, \[A=5\times {{10}^{-5}}{{m}^{2}},\,\,\,t=60\,s\] \[E=0.85\times 5.7\times {{10}^{-8}}\times {{(2000)}^{4}}\times 5\times {{10}^{-5}}\times 60\] E = 2325 JYou need to login to perform this action.
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