Koobee Wublee skrev:
On Feb 8, 3:46 am, "Paul B. Andersen" wrote:
Koobee Wublee wrote:

Thanks for bringing up what I want the Jackal to bring up.
These spectral lines only tell the frequency shift. It says nothing
about the speed and the wavelength. As you know, speed = frequency *
wavelength. Thus, the spectral shift does not invalidate Doppler/
Maxwell's model of classical Doppler shift --- with constant
wavelength but varying speed and frequency. However, to out-guess
what the happy professor might respond, you are going to toss in the
null results of the MMX. Well, does it really indicate invariance in
the speed? Could Voigt be wrong with all others plagiarizing from him
(without giving him any credit)?
Your out-guess is wrong.

Oh, boy. I love the unexpected. If the happy professor fails to
bring up the MMX to support his claim, you are walking on thin ice ---
once again.

My response is:
A diffraction grating spectrometer measures the wavelength.

lambda = d sin(phi) where d is the grating period.

Ah, yes. The diffraction grating spectrometer measures only the
wavelength at your observation. It says nothing about other important
parameters --- especially the ones at the source. shrug

The spectral lines only tell the wavelength shift.

Yes, at the moment of your observation.

It says nothing about the speed and the frequency.

That is correct.

It is experimentally proved that wavelength is Doppler shifted.

Well, I disagree very strongly.

I see.
So when different wavelengths are observed for
the H-alpha spectral line, it is not because the wavelengths
are Doppler shifted differently, but because the wavelengths of
the H-alpha spectral lines are different at the different sources?

And when we measure a cyclic shift in the H-alpha wavelength from a star,
we cannot conclude that it is a cyclic shift in the radial speed
of the star, but must conclude that the wavelength of the H-alpha
transition in all the Hydrogen atoms in that star by some mysterious
reason undergo a cyclic change?


I believe the Gregorian New Year is over. So, please stop drinking
too much unless the happy professor also celebrates the Chinese New
Year in Norway.

Quite.
A comment which reveals a lot of wisdom, of course.
Right to the point, and a very strong argument for why
the observed shifts of the wavelength of spectral lines
are caused by change of the laws of nature at the source,
rather than by Doppler shift.

--
Paul

http://home.c2i.net/pb_andersen/