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metrictensor
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What is the speed of light measured the same by all inertial observers?
kleinwolf said:Is this reasoning correct : suppose we have a non-inertial observer (towards another one)...then considering the local (in time) observer fitted at every time to the non-inertial one...then the speed of light is c for it, so it has to be c for the non-inertial observer at any time...so the speed of light is c for any observer ?
kleinwolf said:Is this reasoning correct : suppose we have a non-inertial observer (towards another one)...then considering the local (in time) observer fitted at every time to the non-inertial one...then the speed of light is c for it, so it has to be c for the non-inertial observer at any time...so the speed of light is c for any observer ?
DaveC426913 said:[tex]3*10^8 \frac{m}{s}[/tex]
or
186,262 miles per second
A Google search would have found this faster.
(Or did you mean to ask why??)
The speed of light is a fundamental constant in physics and is defined as the speed at which electromagnetic radiation travels in a vacuum. It is approximately 299,792,458 meters per second.
The speed of light is considered constant because it is independent of the motion of the observer. This means that no matter how fast an observer is moving, they will always measure the speed of light to be the same value.
This means that no matter how fast an observer is moving, they will measure the speed of light to be the same value. This is a fundamental principle in the theory of relativity and has been extensively tested and confirmed by experiments.
So far, the speed of light has been observed to be constant in all experiments. However, there are some theories that suggest the possibility of variations in the speed of light in certain extreme conditions, such as in the early universe or near black holes. These theories are still being studied and have not been confirmed.
The speed of light is measured by observing the time it takes for light to travel a certain distance. In inertial frames of reference, this measurement is independent of the observer's motion and will always be the same value. This is known as the principle of relativity.