Solution to 2008 Problem 8

We use the Stefan-Boltzman law for the rate at which a blackbody emits radiation:
\begin{align*}\frac{\Delta Q}{\Delta t} = \epsilon \sigma A  T^4\end{align*}
T \to 2 T means that \Delta Q/\Delta t \to 16 \Delta Q/\Delta t. Therefore, answer (D) is correct.

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