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Thermodynamics

# If the temperature of a body is raised by $\;5 \%\;$ . Find increase in radiated energy .

$(a)\;10\%\qquad(b)\;20 \%\qquad(c)\;40 \%\qquad(d)\;5\%$

Answer : $\;20\%$
Explanation :
$U/second=\sigma A T^{4}$
$\large\frac{\bigtriangleup u}{u}= 4\large\frac{\bigtriangleup T}{T}$
$=20\%$