On Tuesday, July 19, 2016 at 12:28:36 AM UTC+5:30, Marko Rauhamaa wrote: > Ian Kelly : > > > Okay, so how is that wavelength defined? > > > > If you needed to mark a meter stick, and all you had was the > > definition of c and the second, how would you do it without measuring > > anything? > > I wouldn't be measuring a meter stick. To measure, say, the height of a > desk, I would bring in some caesium and shine its radiation from the > desk level down to the floor. By counting the ebbs and flows of the > radiation as it leaves the nozzle and strikes the wooden floor I make > the approximage height measurement. > > However, I know *exactly* how long a meter is without making a > measurement.
I recollect — school physics textbook so sorry no link — that in the Newton gravitation law f = -GMm/r² there was a discussion about the exponent of r ie 2 And that to some 6 decimal places it had been verified that it was actually 2.000002 I dont remember all the details Just that something so obviously to a layman mathematic/analytic as 2 for a physicist may be something calling for experimental verification ie synthetic/scienceic: http://plato.stanford.edu/entries/analytic-synthetic/ -- https://mail.python.org/mailman/listinfo/python-list
