Question

A black body at $227^{\circ} C$ radiates heat at the rate of $7\, cals / cm ^{2} s$. At a temperature of $727^{\circ} C$, the rate of heat radiated in the same units will be :

• A. 50
• B. 112
• C. 80
• D. 60

Answer 1

Answer: (B)

112

Answer 2

$P \propto T ^{4}$
$\frac{ P _{2}}{ P _{1}}=\left(\frac{1000}{500}\right)^{4}$
$P _{2}=16 P _{1}=112$