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If we have a standard meter-bar, and a frequency standard for time, andWilliam, Is it not sufficient just to quote the official definition of the meter from NIST? http://physics.nist.gov/cuu/Units/current.html
also a wave which travels at a standard speed... what if we declare the
speed of the wave to be an inalterable universal constant? In that case,
the time standard and the frequency standard are linked together by
definition. But the speed of the wave can no longer be measured.Imagine that the speed of light was declared to be exactly 1 in some
units of measurement...If the speed of light has been declared to be constant, then any detected
changes MUST be in the clock or the length-standard. I don't know if this
is such a good idea. But then, what would happen if the speed of light
were to change slightly? Might this make matter (and meter bars) change
size?
poj