Under Galilean transformations ‘c’ is not the same in all frames of reference and M.E. are not invariant under Galilean transformation. Lorentz transformations can be arrived at by Einsteins postulates, the 2nd being that a light pulse must spread spherically in all frames. M.E. are invariant under Lorentz –- maybe a bit circular but nonetheless suggestive.How does Maxwell equation suggest that the speed of light is same for all observer?
You're very welcome.I found this: http://arxiv.org/pdf/0911.3616v1.pdf
"In the October 2009 issue of the American Journal of Physics Greaves, Ro-
driguez and Ruiz-Camacho report a measurement of the one-way speed of
In the experiment they describe, a light beam is sent from a laser to a
photosensor, and then the signal from the photosensor is transmitted through
a coaxial cable back to the vicinity of the laser. The length of the cable ...“introduces a fixed
time delay of 79 ns”.
What the experiment ... actually
measures is the time for a round trip; the first leg of this round trip is the light
propagating from the laser to the photosensor, and the second leg is the signal
going through the coaxial cable from the photosensor back to the vicinity of the
It is the assumption that the second leg is accomplished with a known
speed (in particular, the round-trip speed of light) that allows the speed of the
first leg to be determined."
The first leg is what I want to measure, is the speed of light.
The second leg is inside the coaxial cable. The signal that travels in this second leg is not the light whose speed I want to measure (yes, its light, its an EM wave, but its generated in my laboratory and travels inside my cable) and I believe the assumption
"the assumption that the second leg is accomplished with a known speed".
(and thank you for your time and patience)