Constant speed of light?
What is the proof that the speed of light is constant?
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Hello NRG62,
what we call the speed of light is actually a Speed (engl. speed), a speedAmount. Speed in the narrower physical sense (cf. velocity) is a Vector size, a size with direction.
However, it is not a tempo like any other, but rather in basic relationships between physical variables (not other are Natural Laws), namely in MAXWELL’s basic equations of electrodynamics.
to show that the speed is constant, you only have to measure it at two different times.
more interesting is that the speed invariant is.
many references to important experiments here:
https://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html#Tests_of_Einsteins_two_postulates
Can only comfort… sometimes ask me if what we observe here in a nothingness in the universe can be generalized.
As always in physics, corresponding experiments are considered proof.
There are some of them in terms of speed of light.
About here:
https://de.wikisource.org/wiki/Constanz_der_Light Speed#:~:text=The%20Existence%20of the%20spectroscopic%20double stars,f%C3%BCr%20the%20Constanz%20d%20double speed.
Michelson-Morley Experiment
That the universe exists and the laws such as E = mc2 are correct.
proven (more precisely: discovered) with the help of physical experiments.
Please read more here:
or in Wikipedia:
Physics!