You need to know the wavelength. You can get that from a diffraction
grating without any knowledge of the speed of light.
Brian
On 6/24/2013 21:56, Jim Lux wrote:
On 6/24/13 5:21 AM, Brian Alsop wrote:
The time issue was effectively eliminated by the Michaelson-Morley
interferometer. One used a monochromatic light and an array of mirrors
which split the light in opposite directions around the track. The two
beams were recombined and an interference pattern resulted. One counted
the number interference fringes passing by while moving one mirror in
one path.
Knowing the number of fringes, wavelength of light and the mirror
movement, one could compute c.
There are easier ways to measure wavelength of an EM wave (Young's
double slit experiment, for instance), or measuring the voltage along a
transmission line carrying a reflected wave.
BUT, then, an interferometer (or melted marshmallows in the microwave
oven) tells you the wavelength of the EM radiation. But you need to
know the frequency of that signal in order to calculate c from that
measurement.
and we're back to the "what can be done simply to measure time/frequency"
(I guess.. it's all really arbitrary.. a meter is so many wavelengths of
the light from a Krypton lamp)
htt
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