Figure: Changing wavelength

Light, microwaves, x-rays, and TV and radio transmissions are all kinds of electromagnetic waves. They are all the same kind of wavy disturbance in the electric force field that repeats itself over a distance called the wavelength.

Credit: Physics 2000, Colorado University at Boulder, http://www.colorado.edu/physics/2000/index.pl.

http://www.colorado.edu/physics/2000/waves_particles/