Physics

Problem

Determine the total power emitted by a spherical object of radius 4 cm whose surface emissivity is 0.60 and whose radiation peaks at 800 nm. Use

b = 2.898 \times 10^{-3}\,\text{m K}

and

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

. a)

2.0 \times 10^{5}\,\text{W}

1.2 \times 10^{4}\,\text{W}

1.2 \times 10^{5}\,\text{W}

3.0 \times 10^{4}\,\text{W}