Physics

Problem

A flat

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

collector plate is coated so that it behaves like a perfect blackbody. While operating at a steady temperature of

340\,\text{K}

for

6.0\,\text{h}

, it converts

20\%

of the thermal energy it emits into electrical energy. Using

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

, how much electrical energy is produced, expressed in kilowatt-hours? a)

0.91\,\text{kWh}

1.8\,\text{kWh}

3.6\,\text{kWh}

9.1\,\text{kWh}