Post-Truth (Einsteinian) Physics

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Sujet : Post-Truth (Einsteinian) Physics
De : pentcho.valev (at) *nospam* gmail.com (Pentcho Valev)
Groupes : fr.sci.astrophysique
Date : 23. Aug 2022, 01:44:03
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Kip Thorne: "If you move toward the [light] source, you see the wavelength shortened but you don't see the speed changed" https://youtu.be/mvdlN4H4T54?t=296

Professor Martin White, UC Berkeley: "...the sound waves have a fixed wavelength (distance between two crests or two troughs) only if you're not moving relative to the source of the sound. If you are moving away from the source (or equivalently it is receding from you) then each crest will take a little longer to reach you, and so you'll perceive a longer wavelength. Similarly if you're approaching the source, then you'll be meeting each crest a little earlier, and so you'll perceive a shorter wavelength. [...] The same principle applies for light as well as for sound. In detail the amount of shift depends a little differently on the speed, since we have to do the calculation in the context of special relativity. But in general it's just the same: if you're approaching a light source you see shorter wavelengths (a blue-shift), while if you're moving away you see longer wavelengths (a red-shift)." http://w.astro.berkeley.edu/~mwhite/darkmatter/dopplershift.html

The motion of the observer changes neither the wavelength of sound nor the wavelength of light:

"Thus, the moving observer sees a wave possessing the same wavelength [...] but a different frequency [...] to that seen by the stationary observer." http://farside.ph.utexas.edu/teaching/315/Waveshtml/node41.html

"The wavelength is staying the same in this case." https://www.youtube.com/watch?v=MHepfIIsKcE

"Vo is the velocity of an observer moving towards the source. This velocity is independent of the motion of the source. Hence, the velocity of waves relative to the observer is c + Vo. [...] The motion of an observer does not alter the wavelength. The increase in frequency is a result of the observer encountering more wavelengths in a given time." http://a-levelphysicstutor.com/wav-doppler.php

Accordingly, if the speed of the observer relative to the light source is Vo, the speed of the light relative to the observer is c'=c+Vo, in violation of Einstein's relativity.

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Pentcho Valev

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23 Aug 22 o Post-Truth (Einsteinian) Physics1Pentcho Valev

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