Fig1_2 Elec Waves
Fig. 1.2 . All forms of radiation consist of electric and magnetic fields that oscillate at right angles to each other and to the direction of travel. They move through empty space at the speed of light. The separation between adjacent wave crests is called the wavelength of the radiation and is usually designated by the lower case Greek letter lambda, l.
Copyright 2010, Professor Kenneth R. Lang, Tufts University