Anew cordless phone emits 4.0 mw at 5.8 ghz. the manufacturer claims that the phone has a range of 100 feet.

if we assume that the wave spreads out evenly with no obstructions, what is the electric field strength at the base unit 100 feet from the phone?

need answer in "dimensions of an electric field" which i believe is n/c.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.