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Is the speed of light variable?

is speed of light variable or constant?Does the speed of light of an object depends on the energy produced and given out of the object to produce light?


As far as anybody knows, the speed of light in a vacuum is constant; in fact, it is the ONLY speed that is constant. If you measure the speed of anything moving slower than light (that is, everything BUT light), your measurement will depend on your own speed as well as the speed of the object you're measuring. In other words, there is no absolute reference frame for sub-light speeds. However, if you measure the speed of light it will be the same regardless of how fast you are moving. That's because time slows down for objects that are moving very quickly, and your perception of light speed will be the same regardless. The energy of light does not affect its velocity through a vacuum in the least. In a transparent material like glass or air, the energy of light DOES slightly affect its speed. That's why prisms can separate white light into its various components; red light is less energetic than violet light, meaning that they have slightly different speeds through glass and therefore bend at slightly different angles. A beam of white light is therefore separated into its various colors as it passes through a prism and the colors are slowed to varying degrees, causing dispersion. I hope that helps. Good luck!
Constant, go faster u will quickly find your self some-when before you set off. it is 300'000'000 Metres per second in a vacuum it is 299'792'458 Metres per second is Air
I dont understand your question exactly, but the speed of light is variable. It has a maximum speed in a vacuum, and has a lower speed when traveling through denser material.
The speed of light in any medium is constant. It will differ in different mediums, for example, glass. That is why a prism produces a spectrum. Light waves are more powerful (higher frequency) toward the blue end of the spectrum, but all light propagates at he same speed.- slightly less than 300,000 km/s in a vacuum.

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