Physics

Problem

A star emits thermal radiation with a luminosity of

3.9\times10^{26}\,\text{W}

and has a uniform surface temperature of

5.8\times10^{3}\,\text{K}

. Assuming the star behaves as an ideal blackbody, which of the following is closest to the star's radius? a)

1.4\times10^{9}\,\text{m}

7.0\times10^{8}\,\text{m}

3.5\times10^{8}\,\text{m}

7.0\times10^{7}\,\text{m}