A) 81 E
B) 9 E
C) 3 E
D) 27 E
Correct Answer: A
Solution :
According to Stefan's law \[E\propto {{T}^{4}}\] \[\therefore \] \[\frac{E'}{E}={{\left( \frac{3T}{T} \right)}^{4}}\]or \[E'=81E\]
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