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From: Sam Wormley on 30 May 2010 01:16
On 5/29/10 3:34 PM, rick_s wrote:
> I need to clarify this. What I mean to say is in water and glass light
> does not travel at c.

Snell's Law
http://en.wikipedia.org/wiki/Snell's_law
From: Sam Wormley on 30 May 2010 01:19
On 5/29/10 2:41 PM, rick_s wrote:
> What about the permittivity and permeability of free space? I think
> there must be some minute drag if for no other reason then perfect
> uniform motion is impossible in a curvy non-Euclidean universe.

What about permittivity and permeability of free space?
http://en.wikipedia.org/wiki/Permittivity

Think about what a straight line is in curved spacetime.
http://en.wikipedia.org/wiki/Geodesic
From: Sam Wormley on 30 May 2010 01:21
On 5/29/10 1:47 PM, rick_s wrote:
> You toss a ball up on a train and Newton's laws apply. Uniform motion
> the ball is already in motion. Now Einstein said that it depends on your
> frame of reference.

Hidden is the law of inertia is that fact the whether an object
is in motion or not depends strictly on the point of view of
the observer.

Affirmed in Newton's laws of motion.

Certainly in agreement with the null results of Michelson-Morley
experiment and subsequent experiments.
http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html
From: rick_s on 29 May 2010 17:25
On 5/30/2010 6:14, Sam Wormley wrote:
> On 5/29/10 4:08 PM, rick_s wrote:
>> If a light wave goes faster than c
>
> Light (photons) DO NOT propagate at any speed other than c.
>
> From the quantum mechanical perspective,
>
> 1. photons are emitted (by charged particles)
> 2. photons propagate at c
> 3. photons are absorbed (by charged particles)
>
> Photon momentum
> p = hν/c = h/λ
>
> Photon Energy
> E = hν

That's apples and oranges. A molecule and a galaxy.

If the universe is expanding, then light waves are shrinking into the
past, we can use a microscope to look at the small things like these
photons and we use a giant orange telescope to look at these tiny
photons from 13 billion years ago.

I know that we use c as the speed of light.
From: Sam Wormley on 30 May 2010 01:34
On 5/29/10 4:25 PM, rick_s wrote:
> On 5/30/2010 6:14, Sam Wormley wrote:
>> On 5/29/10 4:08 PM, rick_s wrote:
>>> If a light wave goes faster than c
>>
>> Light (photons) DO NOT propagate at any speed other than c.
>>
>> From the quantum mechanical perspective,
>>
>> 1. photons are emitted (by charged particles)
>> 2. photons propagate at c
>> 3. photons are absorbed (by charged particles)
>>
>> Photon momentum
>> p = hν/c = h/λ
>>
>> Photon Energy
>> E = hν
>
> That's apples and oranges. A molecule and a galaxy.
>
> If the universe is expanding, then light waves are shrinking into the
> past, we can use a microscope to look at the small things like these
> photons and we use a giant orange telescope to look at these tiny
> photons from 13 billion years ago.
>
> I know that we use c as the speed of light.

An orange telescope is the wrong tool to "see" CMB photons, as
the peak of the black body spectrum is in the microwave range at
around 2.725 K.
http://arxiv.org/abs/0911.1955
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