The energy emitted per second by a black body at $27^o\ C$ is $10\ J$. If the temperature of the black body is increased to $327^o\ C$ , the energy emitted per second will be ......... $J$
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$ U \propto(T)^{4}$
$U_{1}=K(27+273)^{4}$
$10=k(3 00)^{4} ....(i)$
$U_{2}=k(600)^{4}...(ii)$
$(ii) \div(i)$
$\frac{U_{2}}{10}=\left(\frac{600}{300}\right)^{4}=2^{4}=16$
$U_{2}=160 J$
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