A) \[1.7\times {{10}^{3}}J\]
B) \[2.5\times {{10}^{2}}J\]
C) \[8\times {{10}^{3}}J\]
D) \[3\times {{10}^{4}}J\]
E) none of these
Correct Answer: A
Solution :
From Stefans law \[E=\sigma {{T}^{4}}A\] Given, \[T=727{}^\circ C=(727+273)=1000\text{ }K,\] \[A=5\times {{10}^{-4}}{{m}^{2}}\] \[\therefore \]Energy \[=(5.67\times {{10}^{-8}})\] \[{{(1000)}^{4}}(5\times {{10}^{-4}})60\] \[\therefore \] \[E=1.7\times {{10}^{3}}J\]
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