The temperatures of two bodies $A$ and $B$ are ${727^o}C$ and ${127^o}C$. The ratio of rate of emission of radiations will be
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(b) $\frac{{{E_1}}}{{{E_2}}} = {\left( {\frac{{{T_1}}}{{{T_2}}}} \right)^4} = {\left( {\frac{{727 + 273}}{{127 + 273}}} \right)^4}$$ = \frac{{{{(1000)}^4}}}{{{{(400)}^4}}} = \frac{{{{10}^4}}}{{{4^4}}} = \frac{{625}}{{16}}$
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