Physics

Problem

A rectangular electronics enclosure in vacuum has a total surface area of

0.20\,\text{m}^{2}

and an emissivity of

0.60

. The internal components dissipate

300\,\text{W}

of power as heat. One

0.20\,\text{m} \times 0.20\,\text{m}

face is illuminated by sunshine providing

400\,\text{W}\,\text{m}^{-2}

, and the surface absorbs all of this radiation. If the enclosure is in steady thermal equilibrium, what is its surface temperature? (Stefan–Boltzmann constant

\sigma = 5.67\times10^{-8}\,\text{W}\,\text{m}^{-2}\,\text{K}^{-4}

) a)

490\,\text{K}

460\,\text{K}

410\,\text{K}

690\,\text{K}

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