Physics

Problem

A solid sphere of radius

0.10\,\text{m}

has emissivity

0.60

and is kept at

800\,\text{K}

. Determine the total power it radiates. (

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

) a)

0.88\,\text{kW}

2.92\,\text{kW}

1.75\,\text{kW}

1.17\,\text{kW}