Answer
$5.8 \times 10^3 \ K$
Work Step by Step
We simplify equation 16.9 to find:
$ P = (\frac{P}{4 \pi R^2 \sigma})^{1/4}$
$ P = (\frac{3.9 \times 10^{26}}{4 \pi (7 \times 10^8)^2(5.7 \times 10^{-8})})^{1/4}= 5.8 \times 10^3 \ K$
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