The ratio of radiant energies radiated per unit surface area by two bodies is $16 : 1$ , the temperature of hotter body is $1000K$ , then the temperature of colder body will be ....... $K$
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(b) $Q \propto {T^4}$
==> $\frac{{{Q_1}}}{{{Q_2}}} = \frac{{T_1^4}}{{T_2^4}}$
==> $T_2^4 = \left( {\frac{{{E_2}}}{{{E_1}}}} \right)T_1^4$
==> $T_2^4 = \frac{1}{{16}} \times {(1000)^4} = {\left( {\frac{{1000}}{2}} \right)^4}$
==> ${T_2} = 500K$
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