A black body is at $727^o C$. It emits energy at a rate which is proportional to
AIPMT 2007, Easy
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According to Stefan's law, rate of energy radiated $E \propto {T^ \circ }$
where $T$ is the absolute temperature of a black body.
$\therefore \,\,E \propto {\left( {727 + 273} \right)^4}\,\,or\,\,E \propto {\left[ {1000} \right]^4}.$
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