Physics

Problem

A spherical blackbody is required to radiate a total power of

1.2\times10^{25}\,\text{W}

. Its wavelength of maximum emission is

450\,\text{nm}

. Calculate its radius. (Take

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

and

b = 2.898\times10^{-3}\,\text{m\,K}