Answer
$6.72\times10^{-7}\frac{W}{m^2}$
Work Step by Step
The question is asking for the average intensity. This is given by equation 22–8.
$$\overline{I}=\frac{1}{2}\epsilon_ocE_o^2$$
$$=\frac{1}{2}(8.85\times10^{-12}C^2/(N \cdot m^2)) (3.00\times10^8m/s)(0.0225V/m)^2$$
$$=6.72\times10^{-7}\frac{W}{m^2}$$
