Re: Speed of Light: A universal Constant?

From: The Ghost In The Machine (ewill_at_sirius.athghost7038suus.net)
Date: 03/23/05 

Date: Wed, 23 Mar 2005 05:00:12 GMT

In sci.physics, kenseto
<kenseto@erinet.com>
 wrote
on Tue, 22 Mar 2005 14:31:56 GMT
<w%V%d.6496$rL3.4855@fe2.columbus.rr.com>:
>
> "robert j. kolker" <nowhere@nowhere.net> wrote in message
> news:3aamtkF6bbkreU2@individual.net...
>>
>>
>> kenseto wrote:
>>
>> > That's becasue you failed to recognize that Doppler shift
>> > is due to varying speed of light.
>>
>> The speed of light in vacuo relative to any inertial frame is a well
>> measured constant. It has been shown experimentally again and again and
>> has yet to be falsified. The speed of light in vacuo is independent of
>> th motion of the source or the observer.
>
> The speed of light is measured to be constant because we arbitrarily assumed
> that the Doppler shift is due to wave length change. If wave length is
> assumed to be contant then the speed of light is different from different
> sources.
>
> Ken Seto
>

Assume two orbiting stars, far away, with barycenter
motionless with respect to Earth. Assume they orbit with
speed of approximately 10^-4 c = 30 km/s (which is about
Earth's orbital speed), to make the math easy, and that
the nominal radiation is 588 nm (which happens to coincide,
or at least be close to, a sodium line).

Emissive: delta-lambda = 58.8 pm

SR: delta-lambda = 2.94 fm

I'd say that's darned obvious, assuming one can in
fact determine that the velocity is 10^-4 c (which is
a problem). This is admittedly a hypothetical example
but real-world examples abound -- the most cited one
around here appears to be PSR B1913+16, which has a nice
elliptical precessing orbit and goes 15 times faster at
periastron than Earth. 

-- 
#191, ewill3@earthlink.net
It's still legal to go .sigless.

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