Physics - Modern Physics Question with Solution | TestHub

$P_{\mathrm{rad}}=\frac{2I}{\mathrm{C}}$
Where $\mathrm{I}=$ intensity at surface
$\mathrm{C}=$ Speed of light
$\begin{array}{rl}& I=\frac{\text{ Power }}{\text{ Area }}=\frac{450}{4\pi {\mathrm{r}}^2}\\ & =\frac{450}{4\pi \times 4}=\frac{450}{16\pi }\\ & P_{\mathrm{rad}}=\frac{2\times 450}{16\pi \times 3\times 10^8}=\frac{150}{8\pi \times 10^8}\end{array}$
$=5.97\times 10^{-8}\approx 6\times 10^{-8}$ Pascals