Re: some flaws in the questions and answers section of the first chapter
- From: "Mike Mainville" <mikemainville@xxxxxxxxxxxx>
- Date: Sun, 15 Jan 2006 00:03:03 -0500
The photons always travel at the speed c.
When light passes through a medium, the average speed of the light
propagating throught the material is less than c
because the photons are absorbed by the atoms in the materil and then
retransitted. There is a delay of the order of 10^-8 s
between the retransmitions. This delay is what causes the speed of light to
decrease in a medium.
When the light exits the medium, the delays do not exist anymore. Hence, the
speed of light returns to c in a vacuum.
"The old Sorcerer" <vanquish@xxxxxxxxxxxx> wrote in message
news:9Rayf.120707$D47.94769@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
> <StilenX@xxxxxxxxx> wrote in message
> news:1137120216.984733.115190@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > The Final Theory starts off as with some very interesting theories,
> > hower in the questions and answers part of the first chapter, I noticed
> > this question being asked:
> >
> > Q: Light slows as it passes through water or
> > glass, causing it to bend, but how can it
> > return to light-speed on its own once it exits?
> >
> > A: This is impossible in today's science. No object in nature
> > can speed up of its own accord after being slowed. A bullet
> > doesn't spontaneously speed up after it is slowed by passing
> > through a wooden block, so how does a photon of light
> > mysteriously return to its original speed once it exits a glass
> > block?
>
> Glass blocks are not wood blocks.
> http://www.androcles01.pwp.blueyonder.co.uk/speeding%20up%20light.JPG
>
> > Also, continuously shining a light beam through a glass
> > block will heat it, creating the further mystery that the beam
> > actually loses energy as it passes through the glass, yet still
> > manages to accelerate to its original speed upon exit.
>
> Not at all, it doesn't leave if it heats the block.
>
> --
>
> Der alte Hexenmeister ist:
> Sorcerer Androcles Dumbledore, Headmaster, hogwarts.physics
> school for zauberlehrlings.
> "One muggle's magic is another sorcerer's engineering"
>
>
http://www.androcles01.pwp.blueyonder.co.uk/how_to_be_as_smart_as_einstein.h
tm
> http://www.androcles01.pwp.blueyonder.co.uk/people_v_Baez.htm
> http://www.androcles01.pwp.blueyonder.co.uk/sundials.htm
>
>
> > Today's
> > science cannot explain this mysterious everyday occurrence.
>
> Of course it can.
>
>
> >
> > actually, to my understanding (which I must admit is somewhat limited)
>
>
> That's the problem.
>
>
>
> > the light is not slowing down, but instead is changing direction. An
> > object that has changes direction could apear to be slowing down as
> > it's velocity has changed, however it's speed still remains the same.
> > Two objects travelling at the same speed can reach the same point from
> > the same starting point at differnt times depending on the path taken.
> > I would like to add that light actually does add energy through passing
> > through ojects, and it can be seen in the case of a peice of paper
> > covering a flash light - the light is weaker as seen through th
> > flashlight than it is when seen through just air with no paper. The
> > paper will also heat up over time, showing that there is in fact some
> > energy exchage.
> >
>
>
.
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