Re: speed of light

Subject: Re: speed of light
Sunrise: 6:33 Sunset: 19:38 (EDT)
X-Mailer: ELM [version 2.3 PL11]

>
> God day all you folks in NEC-LIST Land
>
> I have just been browsing through the August 1995 Physics Today Buyer's
> Guide. Of interest is the fact that the speed of light is given as
> 299 792 458 m/s, "exact." That's right EXACT. All the other constants
>

> Does anyone out there know when and how come c, Mu(0) and Epsilon(0) were
> defined to have the values given??
>

I remember this being decided within the last 4 years. (I think I read it
in IEEE Spectrum). The logical reason for the change was that every time
we measured length or time more accuratly, we got a better value for c.
However, since c is the ultimate constant, why not fix it and let the other
values be redefined.

BTW Does anyone have the new value of the Volt? It was changed in 1990
from the value ( 2e/h ratio) of 483.5940 GHz/v to something about 9ppm
higher.

-- 
   |\      _,,,---,,_          Michael Katzmann  ( NV3Z / VK2BEA / G4NYV )
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