Why can't light travel faster or slower then what it does?
Light can and does travel slower than the speed of light The speed of light is actually the speed of light in a vacuum. Light travels more slowly when it passes through a medium (any gas, liquid, solid or plasma) The speed of light is an upper bound, that is a maximum speed beyond which nothing can travel and it is the speed at which anything with zero rest mass travels in a vacuum.
Its speed changes depending on what it flows through. It's more than just how fast light goes. It's like a built-in characteristic of the universe, the speed at which electromagnetic radiation propagates. I think Maxwell, known for the math he did with electromagnetism, found out that you can get the speed of light by playing around with other constants.
if im right some scientists did slow light down for a very little bit of time. reason light cant go any slower is the fact that it is a photon particle and cant move any slower or faster it has a constant speed. other wise it would be a different type of particle ( any faster would make it on the order of a tachion(miss spelled sorry) which is still a theory)
The speed of light in a vacuum is determined by two things, the permittivity of free space and the permeability of free space. The permittivity of free space is determined by the strength of electric charge and the permeability of free space is associated with the time it takes to magnetize something and the extent to which the material was magnetized. If you measure the force between two coulomb's of electric charge one meter apart, the force you get is the basis of the permittivity of free space. The permeability of free space is derived from the definition of an Amphere. Basically it is the magnetic force cause by one coulomb of electric current. .
