3.6 x 10^-5 watts per m²
1) Since the formula of the intensity of a beam of light, is
[tex]I=\frac{k}{d^2}\Rightarrow I=\frac{180}{d^2}[/tex]2) And the distance given is 5 km, then we need to convert that to meters 5 km=5000 meters then we can write:
[tex]\begin{gathered} I=\frac{180}{5000^2} \\ I=3.6\times10^{-5} \end{gathered}[/tex]3) Then the Intensity of that TV 3.6 x 10^-5 watts, per m²
