Emitter theory was a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment. Emitter theory keeps part of the principle of relativity but postulates the speed of light is c only relative to its source, instead of the invariance postulate. Thus, emitter theory combines electrodynamics and mechanics with a simple Newtonian theory which has no paradoxes in it. Special relativity (SR) or the special theory of relativity is the physical theory published in 1905 by Albert Einstein. ... The Michelson-Morley experiment, one of the most important and famous experiments in the history of physics, was performed in 1887 at what is now Case Western Reserve University, and is considered to be the first strong evidence against the theory of a luminiferous aether. ... Galilean relativity Historically, the first principle of relativity that was formulated was a principle of relativity of uniform motion suggested by the observation that there doesnt seem to be a phenomenon in dynamics that will allow an observer to establish a zero point of velocity, nor a preferred direction. ... Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, composed of the electric field and the magnetic field. ... Mechanics refers to: a craft relating to machinery (from the Latin mechanicus, from the Greek mechanikos, meaning one skilled in machines), or a range of disciplines in science and engineering. ... Robert Boyles self-flowing flask fills itself in this diagram, but perpetual motion machines do not exist. ...

The base of the theory is Maxwell's equations, which imply that light (and other electromagnetic waves) is a wave of the electromagnetic field. So it can directly be concluded that those waves are propagating relative to this field, which is at rest relative to the charge and the magnitude of the speed is c. Further, if the observer is moving, say at speed v towards this charge, then the speed of the light relative to observer is c+v. Maxwells equations are the set of four equations, attributed to James Clerk Maxwell, that describe the behavior of both the electric and magnetic fields, as well as their interactions with matter. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye, or in a more general sense, any electromagnetic radiation in the range from infrared to ultraviolet. ... Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ... An electromagnetic field is composed of two related vectorial fields, the electric field and the magnetic field. ...

In the 1960s, it became practical to test this theory. Particles called neutral pions were accelerated to near the speed of light in a particle accelerator, and the speed of the photons emitted by decay of those particles was measured. The speed was found to be exactly the same as that of light emitted by the decay of stationary particles. In particle physics, pion (short for the Greek pi meson = P middle) is the collective name for three subatomic particles discovered in 1947: π0, π+ and π−. Pions are the lightest mesons. ... One of the early particle accelerators responsible for development of the atomic bomb. ...