Re: Had enough of the newsgroup scum

In sci.physics.relativity, Randy Poe
<poespam-trap@xxxxxxxxx>
wrote
on Mon, 24 Mar 2008 07:27:29 -0700 (PDT)
<dbf53f72-ea5f-4648-8ae6-cad2bfc3c3c5@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
On Mar 24, 10:15 am, "Androcles" <Headmas...@xxxxxxxxxxxxxxxx> wrote:
"Randy Poe" <poespam-t...@xxxxxxxxx> wrote in message

news:fab383e5-59d5-4d4f-a759-16b88e919e12@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| On Mar 22, 11:04 pm, HW@....(Dr. Henri Wilson) wrote:
| > If you are an astrophysicist you should wake up to the fact that all
starlight
| > DOES NOT move towards little planet Earth at precisely c.
|
| Can you point to an experimental measurement of light
| moving at a speed different from c?

Of course. Blue shift/red shift is often observed.

Can you point to an experimental measurement of light
moving at a speed different from c?

Androcles does have a point. Absent a more precise
definition, a blue-shifted light beam might indeed be
going faster than c, and a red-shifted light beam slower.

Of course other experiments are not consistent with
that result, and I was under the impression that rather
sensitive speed measurements getting both wavelength and
frequency have precluded speed differences.

Also, if lightspeed is *not* c, what is it? Does it have
dependence on wavelength? Frequency? Such would not be
consistent with other experiments. If the difference
is wide enough one would also expect to see rather
interesting fringing effects while observing Saturn's
moons, for example.

And then there's the issue with supernovas. AIUI,
they are routinely observed in other galaxies. I rather
doubt supernovas can be consistently explained with giant
orbiting planets.


In this experimental measurement you have in
mind, what was the distance and the observed transit
time?

You do know there is no aether and Ockham's Razor applies, I trust?

You do know what "speed" means, and how it
is measured, right?

Speed is simply v = d/t in Androcles' world. The
more sophisticated of us can use other expressions;
for example, v = sqrt(2 KE/m) might work in a Newtonian
universe, or
v = sqrt(g * r) if one knows one has a circular orbit,
v = nu * lambda for *any* wave (including light),
or
v = c * sqrt(1 - (lambda/lambda_0)^2) / sqrt(1 + (lambda/lambda_0)^2)
v = c * sqrt(1 - (nu_0/nu)^2) / sqrt(1 + (nu_0/nu)^2)
or v = c * sqrt(1 - 1/gamma^2) in an Einsteinian universe.

One could even use v = sqrt(2gh), where g is the acceleration
of gravity and h the height of the ball.

Depends on what's known.


Can you point to an experimental measurement of light
moving at a speed different from c?

- Randy


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Relevant Pages

  • Re: Had enough of the newsgroup scum
    ... |> Can you point to an experimental measurement of light ... |> moving at a speed different from c? ... | interesting fringing effects while observing Saturn's ... BEFORE the LHC is operational, ...
    (sci.physics.relativity)
  • Re: Had enough of the newsgroup scum
    ... |> | moving at a speed different from c? ... Blue shift/red shift is often observed. ... | Can you point to an experimental measurement of light ... You know there is no aether and Ockham's Razor applies, I trust? ...
    (sci.physics.relativity)
  • Re: Had enough of the newsgroup scum
    ... |> DOES NOT move towards little planet Earth at precisely c. ... | moving at a speed different from c? ... Can you point to an experimental measurement of light ... what was the distance and the observed transit ...
    (sci.physics.relativity)
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