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From: Archimedes Plutonium on 2 Jun 2010 14:02


Enrico wrote:
(snipped)
>
> Oops. Wrong URL on my last post. Should have been:
>
> http://www.physics.ucsb.edu/~phys128/experiments/mossbauer/mossbauer.pdf
>
> Sorry about the confusion.
>
>
>
> Enrico

I do not see where the Pounds/Rebka Experiment necessarily uses the
Mossbauer
Effect. Perhaps they replaced the mylar bag filled with helium with
the Mossbauer
effect?

--- quoting from Wikipedia on Mossbauer ---
In general (depending on the half-life of the decay), gamma rays have
very narrow linewidths. This means they are very sensitive to small
changes in the energies of nuclear transitions. In fact, gamma rays
can be used as a probe to observe the effects of interactions between
a nucleus and its electrons and those of its neighbors. This is the
basis for Mössbauer spectroscopy, which combines the Mössbauer effect
with the Doppler effect to monitor such interactions.
--- end quoting ---

--- quoting Wikipedia on Doppler ---

Christian Johann Doppler (29 November 1803 – 17 March 1853) was an
Austrian mathematician and physicist. He is most famous for what is
now called the Doppler effect, which is the apparent change in
frequency and wavelength of a wave as perceived by an observer moving
relative to the wave's source.
--- end quoting ---

Let me warn the reader, that I am not certain that the Doppler Effect
for light-waves
contradicts Special Relativity. I am exploring that question. In order
to explore something
fully, one has to "believe it is the case" until one can not defend
the position any
longer. So I have to pretend to believe that the Doppler Effect on
light-waves is
bogus because it contradicts Special Relativity.

Now the Doppler effect was discovered in 1842, more than 50 years
before Special
Relativity, so one can quickly understand that a culture of bogus
understanding
would have accrued. If the Doppler Effect had been discovered around
the time of
the Mossbauer Effect 1930s??, then possibly, many would have raised
the question
of whether the Doppler Effect contradicts or is in violation of the
Special Relativity.

Questions and red-flags would have gone up on the Doppler Effect for
Special
Relativity, especially with the example given of where someone is
riding in a
rocket and observing an oncoming lightwave and thinking that the speed
of the
rocket added to the speed of light is the resultant vector speed. But
no matter
how fast the rocket is going, even if it was going 1/2c that the
resultant vector
speed is still c. So that is Special Relativity, and would that not
also say that
the Doppler Effect is bogus and contradictory to Special Relativity?


Archimedes Plutonium
http://www.iw.net/~a_plutonium/
whole entire Universe is just one big atom
where dots of the electron-dot-cloud are galaxies
From: Archimedes Plutonium on 2 Jun 2010 14:06


Archimedes Plutonium wrote:
> Enrico wrote:
> (snipped)
> >
> > Oops. Wrong URL on my last post. Should have been:
> >
> > http://www.physics.ucsb.edu/~phys128/experiments/mossbauer/mossbauer.pdf
> >
> > Sorry about the confusion.
> >
> >
> >
> > Enrico
>
> I do not see where the Pounds/Rebka Experiment necessarily uses the
> Mossbauer
> Effect. Perhaps they replaced the mylar bag filled with helium with
> the Mossbauer
> effect?
>
> --- quoting from Wikipedia on Mossbauer ---
> In general (depending on the half-life of the decay), gamma rays have
> very narrow linewidths. This means they are very sensitive to small
> changes in the energies of nuclear transitions. In fact, gamma rays
> can be used as a probe to observe the effects of interactions between
> a nucleus and its electrons and those of its neighbors. This is the
> basis for Mössbauer spectroscopy, which combines the Mössbauer effect
> with the Doppler effect to monitor such interactions.
> --- end quoting ---
>
> --- quoting Wikipedia on Doppler ---
>
> Christian Johann Doppler (29 November 1803 – 17 March 1853) was an
> Austrian mathematician and physicist. He is most famous for what is
> now called the Doppler effect, which is the apparent change in
> frequency and wavelength of a wave as perceived by an observer moving
> relative to the wave's source.
> --- end quoting ---
>
> Let me warn the reader, that I am not certain that the Doppler Effect
> for light-waves
> contradicts Special Relativity. I am exploring that question. In order
> to explore something
> fully, one has to "believe it is the case" until one can not defend
> the position any
> longer. So I have to pretend to believe that the Doppler Effect on
> light-waves is
> bogus because it contradicts Special Relativity.
>
> Now the Doppler effect was discovered in 1842, more than 50 years
> before Special
> Relativity, so one can quickly understand that a culture of bogus
> understanding
> would have accrued. If the Doppler Effect had been discovered around
> the time of
> the Mossbauer Effect 1930s??, then possibly, many would have raised

Sorry, discovered 1957, not in the 1930s and changed on my original
post
followed with a (sic) sign.

> the question
> of whether the Doppler Effect contradicts or is in violation of the
> Special Relativity.
>
> Questions and red-flags would have gone up on the Doppler Effect for
> Special
> Relativity, especially with the example given of where someone is
> riding in a
> rocket and observing an oncoming lightwave and thinking that the speed
> of the
> rocket added to the speed of light is the resultant vector speed. But
> no matter
> how fast the rocket is going, even if it was going 1/2c that the
> resultant vector
> speed is still c. So that is Special Relativity, and would that not
> also say that
> the Doppler Effect is bogus and contradictory to Special Relativity?
>
>
> Archimedes Plutonium
> http://www.iw.net/~a_plutonium/
> whole entire Universe is just one big atom
> where dots of the electron-dot-cloud are galaxies
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