Ø A magnetic field will be produced in empty space if there

        is a changing   electric field.

Ø This, in turn, causes the electric field to change - which

         produces a magnetic field.

Ø Net result: a wave of electric and magnetic fields that

         propagate through space.

Ø The magnitude of both E and B decrease with distance as

         1/r

Ø The energy carried by the electromagnetic wave is

        proportional to the square of the amplitude

Ø The Intensity of the wave decreases as 1/r2

Ø The electric and magnetic fields at any point are

         perpendicular to each other.

Ø The electric and magnetic fields at an point are

        perpendicular to the direction of travel.

Ø v = speed of electromagnetic waves = E/B

Ø v = measured speed of light in a vacuum