A) 80
B) 60
C) 50
D) 112
Correct Answer: D
Solution :
Using Stefan's law \[\frac{{{E}_{2}}}{{{E}_{1}}}={{\left( \frac{{{T}_{2}}}{{{T}_{1}}} \right)}^{4}}\] \[\therefore \] \[\frac{{{E}_{2}}}{7}={{\left( \frac{727+273}{227+273} \right)}^{4}}\] \[\frac{{{E}_{2}}}{7}={{\left( \frac{1000}{500} \right)}^{4}}={{(2)}^{4}}=16\] \[{{E}_{2}}=16\times 7=112\,cal/c{{m}^{2}}-s\]You need to login to perform this action.
You will be redirected in
3 sec