Scottish physicist James Clerk Maxwell(1831–79), wrote equation that are simply enlightening. He worked on the ideas of Faraday and Kelvin, and succeeded in unifying electricity and magnetism, identifying the electromagnetic nature of light, and postulating the existence of other electromagnetic radiation.
Visible light, x-rays, sunlight , radio waves, television waves, wifi signals, bluetooth signals, cell phone transmission, and GPS all consist solely of Electric and Magnetic Fields. And how they propagate and interact with materials is completely determined by the above 2 equations of Maxwell.
First equation: The electric flux through a closed surface is proportional to the total charge enclosed by that surface.
Second equation: Maxwell second equation is also a form of Gauss’s law, only with magnetic flux instead of electric flux.
Third equation is modified version of Faraday’s equation.
Speed of the waves
Although Wi Fi surround the enviroments as a energy field, it’s not visible to a eye. It is shared radio channel and each computer listen the channel. Cell phones,televisions and radios also do use the radio waves. However their (the waves) unique height, power (amplitude), distance from each other, and their travelling speed give them a clean transmission that cannot interrupted by other signals. For example, they are longer than microwaves and shorter than radio waves. Wifi routers are antenna. Their ability is sending the data over multiple frequencies all at the same time.
Radio frequency energy is part of the electromagnetic spectrum that includes visible light and x rays. Heinrich Hertz is a German physicist discovered radio waves in 1888 by providing the existence of electromagnetic waves theorized by James Clerk Maxwell’s electromagnetic theory of light.