A solid copper sphere of radius is maintained at in vacuum

PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

A solid copper sphere of radius

0.10\,\text{m}

is maintained at

800\,\text{K}

in vacuum. Assuming it behaves like a perfect blackbody, calculate the total power it radiates. (Take

\sigma = 5.67 \times 10^{-8}\,\text{W}\,\text{m}^{-2}\,\text{K}^{-4}