Why is the speed of light 300,000 Km./sec.?

Answer 1

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That is the speed of light in a vacuum. That speed results from two basic constants of nature: the electrical permittivity and permeability of a vacuum. Permittivity e0 is the constant that relates the force between static electric charges to the magnitude of charge, and permeability µ0 relates the magnetic force between moving charges. When Maxwell's equations are solved for self-sustaining electric and magnetic fields, the result is an equation for a wave that travels at a velocity given by

c = √[1/e0*µ0]

which is the speed (in a vaccum) of electromagnetic radiation (light, radio waves, etc.) In brief, the speed of light results from the electrical properties of free space.

The 0 in the constants e0 and µ0 refers to free space. In other materials these constants are different, and so the speed of light is different. The speed of electromagnetic waves in any medium is

c' = √[1/e•µ]

where e and µ are the permittivity and permeability of that medium.

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Answer 2

Speed of light is different in different medium. This is speed in free space or vaccum. Speed of light is lower in glass or water.

Now why light has speed is infact the speed with which electromagnetic energy propagates

Answer 3

The same reason the diameter of the Earth is 7,926.41 miles.

Answer 4

excatly, its not just visible light that travel at this speed, even UV rays, Cosmic rays Infrared rays travel at teh same speed. its because electromagnetic rasiations propagate at this speed.

Answer 5

The velocity of light in vacuum is that value. It has to be some value isn't it? Same question can be asked if the velocity is not 300,000 km/sec but say 500,000 km/sec.

Answer 6

its basically because the universe works that way naturally 300k is just a number man has made to describe natural laws however it has to do with the liek relativity and cosmic speed limits to really undertsand it .... however light travels in a particle called a photon also describes as a wave or electromagnetic radiation minus techincalities of e=mc^2 it has no mass which means it can accelate to the cosmic level of maximum which happens to be 300,000 Km./sec. which is extremly fast

Answer 7

According to my Fractal Foam Model of Universes, the ether is a foam identical to the cosmic foam but about 10^60 times smaller in scale (not smaller in size because both are infinite). Light consists of s-waves propagating thru the ether, just like acoustic s-waves thru a chemical foam, like pumice. The speed of acoustic s-waves is the sheer modulus (stiffness) of the medium divided by the inertial density of the medium. I suspect that the ether is ultra-ultra-ultra-dense and therefore ultra-ultra-ultra-stiff. I am a long way from being able to put numbers on these parameters, but the ratio must equal the speed of light.

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