Those type experiments are still questionable along with the "doppler effect" reasoning used to determine the differences.
| > They all seem to have the lightsource moving toward the observer | > and they measure the lightsource speed to the observer. | | There's no difference between the lightsource moving towards the observer | and the observer moving towards the lightsource.
Actually there would be, the lightsource will always emit at c. the object heading towards it is what I think would not read such a c.
| That's just basic vector | math. The experiments where you saw the lightsource moving towards the | observer *are* experiments where the observer was heading towards the | lightsource.
No, It is not the same.
| > But of course if you used sound the same way, | > sound could be considered constant to all also like such, | > since it can not leave the source at any different rate no | > matter it's speed also. | | Speed of sound depends on temperature and material.
So does light. Light also travels through mediums at different speeds and is effected by heat etc.. (ever see a hot roadway with light passing above it?). One needs a single medium and an object towards the lightsource experiment to see about a c speed being detected by the object heading towards the lightsource.
| Observers experimenting | on the same material at the same temperature will always get the same speed | of sound. Just like observers experimenting on light in a vacuum (assuming | all vacuums are the same, which they pretty much are by definition).
No actually, observers traveling towards the sound source will find a relative speed change "doppler effect" and the speed is the only thing causing such change of frequency.
| The | difference is that sound requires a transmission medium, so you have to | measure speed of sound against the transmission medium. Light doesn't need | a transmission medium, so motion between the observer and the vacuum is | irrelevant.
Sound doppler has nothing to do with the medium when the medium is not moving.
If an object is traveling towards light real fast, it also incurs a doppler effect of the light. I suggest this effect is caused by the change in relative speed. and I can not find any Earth based experiment that has tested this type of motion. (object moving towards lightsource)