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Einstein's Relativity and the Wavelength of Light

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Pentcho Valev

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May 28, 2023, 7:49:51 PM5/28/23
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The principle of relativity says that frequency, wavelength and speed of light, as measured by the emitter, do not vary with the speed of the emitter. Yet explanations of the Doppler effect implicitly suggest that the wavelength does vary at the emitter:

https://youtube.com/watch?v=xsVxC_NR64M

https://youtu.be/3mJTRXCMU6o?t=77

Stephen Hawking, "A Brief History of Time", Chapter 3: "Now imagine a source of light at a constant distance from us, such as a star, emitting waves of light at a constant wavelength. Obviously the wavelength of the waves we receive will be the same as the wavelength at which they are emitted (the gravitational field of the galaxy will not be large enough to have a significant effect). Suppose now that the source starts moving toward us. When the source emits the next wave crest it will be nearer to us, so the distance between wave crests will be smaller than when the star was stationary." http://www.fisica.net/relatividade/stephen_hawking_a_brief_history_of_time.pdf

Einsteinians have a problem here. They accept the principle of relativity and agree that the wavelength of light, as measured by the emitter, does not vary with the speed of the emitter. On the other hand, as measured by the observer/receiver, the wavelength SHOULD vary with the speed of the emitter (otherwise the speed of light is variable, not constant). So the theory effectively says that the wavelength variation is undiscoverable initially, when it is created at the emitter, and becomes discoverable only by the observer/receiver, at the end of the light travel. This is obviously idiotic and extremely dangerous - could be exposed by any sane person. Einsteinians camouflage the idiocy at the expense of an apparent violation of the principle of relativity - they present the wavelength as varying at the emitter. Some danger remains but it is immeasurably smaller.

Pentcho Valev https://twitter.com/pentcho_valev
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