A point source emits monochromatic electromagnetic waves into air uniformly in all directions. At a distance of 5 m away from the source you detect the wave with an electric field amplitude of 20 V/m. Determine the amplitude of the electric field (in V/m) at a distance 40 m. Moving to another question will save this response.

A point source emits monochromatic electromagnetic waves into air uniformly in all directions. At a distance of 5 m away from the source you detect the wave with an electric field amplitude of 20 V/m. Determine the amplitude of the electric field (in V/m) at a distance 40 m. Moving to another question will save this response.