I am a visual thinker.
I had read about the Michelson-Morley experiment, but it wasn’t until I saw the graphics towards the end of this video that I felt I understood the basic set up of the physical apparatus.
“What is called "transverse Doppler" is a misnomer, it's just time dilation. That effect comes on top of the Doppler effect.”
In post #3, I wrote:
“1. There is an additional Doppler shift due to time dilation.
2. This additional Doppler shift is called the “transverse Doppler effect.””
And so, it looks like I got that part right!?! The only difference in logic between your three sentences and my two points is that I simply label the time dilation addition (via the intermediary step of time dilation = additional Doppler shift) as “transverse Doppler effect” while you judge this label, and judge it as negative, in addition to what I’ve said.
I got the above right, right? No?
“… only some info about the set-up is lacking.”
For me this is not an aside.
I skimmed over the Wikipedia article again, looking at its drawings and looking for written descriptions of its physical make up, but I couldn’t find much.
Thank you for responding Tim88, and thank you for considering my problem.
For me to understand Ives-Stilwell, for me to understand the mechanics of it, I see to first be able to see a picture of it in my mind. That’s me and how my mind works.
This picture is from: http://www.mrelativi...p_Flawed_P2.htm (After finding the picture on Google Image Search I then read the opening paragraph on his web page and it has something to do with replacing Einstein with something else. I don’t know about any of that. His drawing seemed better than the other drawings in Google, to me, someone who doesn’t yet understand this experiment, just from a visual simple perspective, and so that’s why I posted it here. Maybe it will help with this discussion.)
This is the original drawing from the 1938 Journal of the Optical Society of America Ives-Stilwell article. (http://spiff.rit.edu...er/doppler.html)
“The basic idea was that one can accurately determine the forward and the backward Doppler shifts”
“- light emitted in the forward direction (to the right in your drawing)
- light emitted in the backward direction but next reflected by the mirror inside the tube.”
I am missing from my drawing (and my description). This is my new drawing:
“That mirror is an important element that is lacking in the Wikipedia drawing.”
In the Einstein-denier’s drawing there is a graphical element labeled “mirror” and in the original drawing, near “C” or perhaps labeled as part of “C”, there is also something that could be a mirror in this same place. I took a shot at it and put a “mirror” into my drawing based on these other two drawings. Please let me know if, in my drawing, it is misplaced or if it misrepresents the setup of the apparatus.
“All that light went through the slit (shown in the Wikipedia drawing) and was next focused on the spectrometer's metal-glass grating which reflected the light onto a photographic plate (with again a focusing lens). Thanks to the grating, the image of the slit is split in different bands depending on the emission frequency.”
I put a similar diagonal line with a gap in the middle as used in Wikipedia which I believe must represent the “slit” in the “grate,” but I’m not sure so I didn’t label it in the drawing (yet).
I need to go understand how a spectrometer works before I change “detector” to “spectrometer” in my drawing (assuming that’s one of the things I need to change). I understand that the broken diagonal line in the Wikipedia drawing is necessary and will include it but I first need to understand what the detector is doing before, I think, I can then go on to understand what the “slit” and what the “grating” are doing.
(It’s interesting that the Einstein-denier’s drawing and the original drawing do not include a spectrograph. But, maybe, when I understand this experiment better, this won’t seem interesting at all.)
“The basic idea was that one can accurately determine the forward and the backward Doppler shifts, and these relate to each other for a given particle that is going at a certain speed at a given time. But due to time dilation the short wavelengths (high f) are longer than classically expected, and the long wavelengths (low f) are also longer than classically expected. Compared to the Doppler shifted wavelength they are thus both redshifted. And that creates an asymmetry in the frequency shifts that can be measured, as discussed in Wikipedia.
I'll now look up the details of the measurement set-up.”
“For classical theory there is only Doppler and for each rest frequency line there would be equal distance to the Doppler shifted lines. The deviation from that symmetry is a measure of the time dilation.”
I don’t understand (yet), but I believe I will be able to understand once I have a picture of the physical device, and the physical process within that device, in my head.
Question for you both:
Is the “light emitted in the backward direction” [Time88] also “canal/channel rays” (distinct streams of “positive ions” [swansont]) or have the distinct streams started to diffuse?
Or does my very question demonstrate a misunderstanding of some basic physics?
And please tell me if I need to change my drawing.
Thank you both.