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