Tue, 25 November 2014
The airwaves today are filled with electronic waves. Forget about TV signals; that was yesterday. Today we have not only TV, but AM and FM radio waves, microwaves, infrared, short-wave, cordless, Wi-Fi, weather radar, and you-name-it. This is aside from visible light waves, ultraviolet radiation, X-rays and even gamma rays, not to mention gravitational radiation. We may not be able to see many of these, but they are everywhere around us, filling all the available spots in the frequency spectrum. |