Highly misleading. When we say the speed of light is a constant, we mean that it is constant in any frame of reference, and not in a particular absolute frame. This is a fundamental postulate of Einstein's theory and was not there in the Lorentz/Poincare theory of relativity.
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Einstein made two conceptually different assumptions about light: one is a convention and the other one is physical. The latter is that the two-way speed for light from any point A to any point B back to A is always the same. Induction from experiments /1/
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This is true up to a point. When Wilberforce Nutter (1853-1927) carried a lantern on horseback from Swindon to Pewsey in 1894, the light speed varied between 18 and 20 km/h. But near Devizes it approached 22 km/h. Light goes faster downhill.
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Can electromagnetic waves be fully and correctly described by classical electromagnetism?
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EM waves are quantized (photons). At some point classical electromagnetism breaks down and you need quantum mechanics. Classical electromagnetism for instance cannot account for the EM wave transmission through a semiconductor RF transistor. You need quantum theory.
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I am going to be a pedant here. This only proves c is a constant because it assumes both ε0 and μ0 are constants (apols - I don’t know how to do 0 as a subscript).
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If I understand it properly, this assumes an absolute classical vacuum (a real nothingness) so there is no way ε0 and μ0 are anything but constants
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This does not proves that c is constant in any frame of reference any more than the sound wave equation proves that the speed of sound is a constant.pic.twitter.com/AwrYXpnUHB
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well Maxwell equations are Lorentz invariant, so yes this proves that c is the same under the action of the Lorentz group.
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EMTL - Old wine.

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haha then analog electronics ll be naatu saraya
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