An 800-kHz radio signal is detected at a point 9.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.23 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity I at that point? Useful constants: c = 3.0 * 10^8 m/s, Ho = 4Ï€ * 10^-7 T m/A, Eo = 8.85 * 10^-12 C^2/N m^2. Units: V/m is the same as N/C for the unit of electric field E. km = 1 * 10^3 m, kHz = 1 * 10^3 Hz.