Solution: Two sources of sinusoidal electromagnetic waves have average powers of P1 = 100.0 W and P2 = 320 W and emit uniformly in all directions. For the electromagnetic wave with P 1 = 100.0 W find the ratio of intensity S1 10 m away from the source to the intensity S 1 100m away from the source, i.e. S1 (10m)/S1(100m) (Hint: Area of sphere 4πR2)

Two sources of sinusoidal electromagnetic waves have average powers of P_{1} = 100.0 W and P_{2} = 320 W and emit uniformly in all directions. For the electromagnetic wave with P _{1} = 100.0 W find the ratio of intensity S_{1} 10 m away from the source to the intensity S _{1} 100m away from the source, i.e. S_{1} (10m)/S_{1}(100m) (*Hint: Area of sphere* *4πR ^{2}*)