Intensity $=I=\frac{\text{P}\text{o}\text{w}\text{e}\text{r}}{4r^2}=\frac{4{10}^{-5}(W)}{4(1\mathrm{.}2(m){)}^2}=2\mathrm{.}21{10}^{-6}\frac{(W)}{m^2}$