Re: The relationship between meter, speed of light and c
- From: bz <bz+spr@xxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 13 Feb 2007 17:44:27 +0000 (UTC)
"kenseto" <kenseto@xxxxxxxxxx> wrote in
news:45d1e49b$0$24759$4c368faf@xxxxxxxxxxxxxx:
No no one-way speed of light was ever measured. All the past experiments
were based on two-way measurements. The one-way speed of light was
assumed to be the same as the two way speed of light because both both
are experimentally found to be isotropic.
Also the previous two way measurements of the speed of light is not
average to 299,792,458 meters/sec. The following link summarizes the
past two-way light speed measurements:
http://hermes.physics.adelaide.edu.au/~dkoks/Faq/Relativity/SpeedOfLight/
measure_c.html
3. Bases on 2, the meter was REDEFINED as being the distance covered
by light in 1/299,792,458 seconds.
NO....the current defintion for light speed is derived from the
equation: c= (detected wavelength)(detected frequency)
These do NOT say that the one way speed of light CAN not be measured.
They just say that it no longer makes SENSE to measure the speed of light
because both distance and time are now DEFINED using the motion of light.
Aside: you can NOT use your primary standards to calibrate your equipment
Unless you --in effect-- 'measure' the speed of light, but you use that
measurement to set clock speed and to calibrate rulers.
During the time before the speed of light was made the primary standard,
many measurements of the speed of light were made and it was found that
light traveled at a constant velocity in vacuum.
That is why the definition of the meter and the second were changed. Now,
any lab can have a 'primary standard' available, just by building the right
equipment.
--
bz
please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.
bz+spr@xxxxxxxxxxxxxxxxxxxx remove ch100-5 to avoid spam trap
.
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