A) \[120W\]
B) \[240W\]
C) \[320W\]
D) \[360W\]
Correct Answer: C
Solution :
For a black body\[\frac{Q}{t}=P=A\sigma {{T}^{4}}\] \[\Rightarrow \]\[\frac{{{P}_{2}}}{{{P}_{1}}}={{\left( \frac{{{T}_{2}}}{{{T}_{1}}} \right)}^{4}}\Rightarrow \,\,\,\,\frac{{{P}_{2}}}{20}={{\left( \frac{273+727}{273+227} \right)}^{4}}\] \[\Rightarrow \]\[\frac{{{P}_{2}}}{20}={{(2)}^{4}}\] \[\Rightarrow \] \[{{P}_{2}}=320W\]
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