A) 400
B) 80
C) 40
D) 15
Correct Answer: B
Solution :
According to Stefan's law radiant energy emitted by a perfectly black body per unit area per sec (.ie, emissive power of black body) is directly proportional to the fourth power of its absolute temperature ie, \[E\propto {{T}^{4}}\] \[\Rightarrow \] \[\frac{{{E}_{1}}}{{{E}_{2}}}=\frac{T_{1}^{4}}{T_{2}^{4}}\] \[\frac{5}{{{E}_{2}}}=\frac{{{(273+227)}^{4}}}{{{(273+727)}^{4}}}\] \[\Rightarrow \] \[{{E}_{2}}=5\times {{\left[ \frac{1000}{500} \right]}^{4}}\] \[=5\times 16=80\,cal\,c{{m}^{-2}}\,{{s}^{-1}}\]You need to login to perform this action.
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