A) 40 units
B) 160 units
C) 320 units
D) 640 units
Correct Answer: C
Solution :
Heat radiated by black body \[E=\sigma A{{T}^{4}}\Rightarrow E\alpha {{T}^{4}}\] \[or\frac{{{E}_{1}}}{{{E}_{2}}}=\frac{T_{1}^{4}}{T_{2}^{4}}\]or\[\frac{20}{{{E}_{2}}}={{\left( \frac{500}{1000} \right)}^{4}}={{\left( \frac{1}{2} \right)}^{4}}=\frac{1}{16}\] \[\Rightarrow \]\[{{E}_{2}}=16\times 20\,cal\,{{m}^{-2}}{{s}^{-1}}\]\[=320\,cal\,{{m}^{-2}}{{s}^{-1}}\]
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