The heat radiated per unit area in $1\,hour$ by a furnace whose temperature is $3000\,K$ is $( \sigma = 5. 7 \times 10^{-8}\,W\,m^{-2}\,K^{-4})$
AIEEE 2012, Medium
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According to $Stefan's\,law$
$E = \sigma {T^4}$
Heat radiated per unit area in $1\,hour$ $(3600s)$
is
$ = 5.7 \times {10^{ - 8}} \times {\left( {300} \right)^4} \times 3600 = 1.7 \times {10^{10}}\,J$
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