In radiation 'ventriloquism,' electromagnetic waves travel backwards
Tuesday, September 23, 2008 - 13:07
in Physics & Chemistry
(PhysOrg.com) -- Typically, electromagnetic waves travel away from their sources. For instance, a radar system emits radio waves that travel all the way to a target, such as a car or plane, before being reflected back to the source. Police officers and the military rely on the forward movement of the waves to determine the speed or location of an object.