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tech / sci.math / Re: Twin paradox article in Wikipedia

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o Re: Twin paradox article in WikipediaMeredith Adamou

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Re: Twin paradox article in Wikipedia

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https://www.novabbs.com/tech/article-flat.php?id=140909&group=sci.math#140909

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From: utt...@mddaeaem.tt (Meredith Adamou)
Newsgroups: sci.physics.relativity,sci.physics,sci.math
Subject: Re: Twin paradox article in Wikipedia
Date: Sun, 16 Jul 2023 18:55:34 -0000 (UTC)
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 by: Meredith Adamou - Sun, 16 Jul 2023 18:55 UTC

Tom Roberts wrote:

> On 7/16/23 6:36 AM, J. J. Lodder wrote:
>> Spectrographs using gratings cannot 'measure' wavelengths at all. They
>> can at best compare wavelengths. (if you really insist)
>
> Nonsense!
> First, any measurement using a unit is actually a comparison (of the
> measurement to the unit).
> Second, every analysis I have ever seen of a diffraction grating is
> based on the wavelength of the light, not its frequency. In particular,
> using c/f instead of wavelength is valid only in vacuum.
> Third, if what you claim were true, then a given laser and grating would
> show the same deflection angle when the grating is immersed in water or
> in air (the frequency of the light is the same, its wavelength isn't.).
> The angle changes corresponding to the wavelength, not the frequency.

absolutely, but there are nu units in wavelengths. So I guess is a
comparison to a predefined chroma/color. Actually is even more complicate,
as for instance, depending on intensity a "red" may have tons of nuances.
How are these thing calibrated?

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