The original temperature of a black body is ${727^o}C.$The temperature at which this black body must be raised so as to double the total radiant energy, is ....... $K$
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(b) $\frac{{{Q_2}}}{{{Q_1}}} = {\left( {\frac{{{T_2}}}{{{T_1}}}} \right)^4} \Rightarrow \frac{2}{1} = {\left( {\frac{{{T_2}}}{{{T_1}}}} \right)^4}$
$ \Rightarrow T_2^4 = 2 \times T_1^4 = 2 \times {(273 + 727)^4}$ ==> ${T_2} = 1190K$.
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