Transverse Wave Motion

In transverse wave motion, the individual particles that make up the medium oscillate or vibrate about their own fixed mean (equilibrium) positions in a direction that is perpendicular to the direction the wave itself propagates -- which is also the direction the wave's energy is being transferred. Light, an electromagnetic wave, is the standard example: although light needs no material medium at all, its oscillating electric and magnetic fields point perpendicular to the direction the light beam travels, which is exactly the geometric signature of a transverse disturbance. A mechanical transverse wave can also be produced directly, for instance by shaking one end of a stretched string or rope up and down: each small segment of the string moves vertically, up and down, even though the disturbance pattern as a whole travels horizontally along the string's length. This perpendicular relationship between particle motion and wave …