Changes

EM radiation is a disturbance in an [[electric field]]. It consists of an energy particle called a [[photon]] which carries no [[electric charge]] and is [[mass]]less. Debate over whether light was a wave or consists of particles was finally solved when [[quantum physics]] revealed all particles have wavelengths, but this is not generally noticeable in normal matter.  

EM radiation is a disturbance in an [[electric field]]. It consists of an energy particle called a [[photon]] which carries no [[electric charge]] and is [[mass]]less. Debate over whether light was a wave or consists of particles was finally solved when [[quantum physics]] revealed all particles have wavelengths, but this is not generally noticeable in normal matter.  

The EM spectrum consists of the following types of photon radiation (in order of increasing wavelength): [[gamma ray]]s, [[x-ray]]s, [[ultraviolet light]], [[visible light]], [[infrared light]], [[microwaves]] and [[radio waves]].

The EM spectrum consists of the following types of photon radiation (in order of increasing wavelength): [[gamma ray]]s, [[x-ray]]s, [[ultraviolet|ultraviolet light]], [[visible light]], [[infrared|infrared light]], [[microwave]]s and [[radio waves]].

The [[speed of light]] is about 186,300 [[mile]]s (300,000 kilometers) per second; it would take an infinite amount of force to accelerate a mass faster than the speed of light, which leads the speed of light to be jokingly referred to as the universal speed limit.<ref>See [[Special Theory of Relativity]]</ref> The [[Michelson-Morley experiment]] proved that the speed of light (and everything else that is massless) will always be measured by an observer to be the same, in every frame of reference, no matter how fast the source or the observer are moving. This gives rise to the [[theory of relativity]].

The [[speed of light]] is about 186,300 [[mile]]s (300,000 kilometers) per second; it would take an infinite amount of force to accelerate a mass faster than the speed of light, which leads the speed of light to be jokingly referred to as the universal speed limit.<ref>See [[Special Theory of Relativity]]</ref> The [[Michelson-Morley experiment]] proved that the speed of light (and everything else that is massless) will always be measured by an observer to be the same, in every frame of reference, no matter how fast the source or the observer are moving. This gives rise to the [[theory of relativity]].