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tech / sci.physics.relativity / [SR] Relativistic wavelengths

SubjectAuthor
* [SR] Relativistic wavelengthsRichard Hachel
`* Re: [SR] Relativistic wavelengthsRichard Hachel
 `- Re: [SR] Relativistic wavelengthsRichard Hachel

1
[SR] Relativistic wavelengths

<TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp>

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https://www.novabbs.com/tech/article-flat.php?id=82617&group=sci.physics.relativity#82617

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From: r.hac...@tiscali.fr (Richard Hachel)
 by: Richard Hachel - Fri, 18 Feb 2022 19:43 UTC

<http://news2.nemoweb.net/jntp?TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp/Data.Media:1>

In a given reference frame R, a small monochromatic light emits in the
yellow.

When O' crosses O, the position of the lamp forms an angle µ with the Ox
axis in R.

1. What will be the value of this angle in R'?

2. What will be the new observed monochromatic wavelength?

Answers:

cosµ'=(cosµ+v/c)/(1+cosµ.v/c)

λ'=λ.sqrt(1-v²/c²)/(1-cosµ.v/c)

<http://news2.nemoweb.net/?DataID=TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp>

R.H.

--
"Mais ne nous y trompons pas. Il n'y a pas que de la violence
avec des armes. Il y a des situations de violence".
Abbé Pierre.

Re: [SR] Relativistic wavelengths

<AyUxKB_gUqOdxWOlEj39LVjtuks@jntp>

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https://www.novabbs.com/tech/article-flat.php?id=82620&group=sci.physics.relativity#82620

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From: r.hac...@tiscali.fr (Richard Hachel)
 by: Richard Hachel - Fri, 18 Feb 2022 19:52 UTC

Le 18/02/2022 à 20:43, Richard Hachel a écrit :
> <http://news2.nemoweb.net/jntp?TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp/Data.Media:1>
>
> In a given reference frame R, a small monochromatic light emits in the yellow.
>
> When O' crosses O, the position of the lamp forms an angle µ with the Ox axis
> in R.
>
> 1. What will be the value of this angle in R'?
>
> 2. What will be the new observed monochromatic wavelength?
>
> Answers:
>
> cosµ'=(cosµ+v/c)/(1+cosµ.v/c)
>
> λ'=λ.sqrt(1-v²/c²)/(1-cosµ.v/c)
>
> <http://news2.nemoweb.net/?DataID=TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp>
>
> R.H.

And, obviously:
x'=(x-v.to)/√(1-v²/c²)
y'=y
z'=z
to'=(to-v.x/c²)/√(1-v²/c²)

R.H.

--
"Mais ne nous y trompons pas. Il n'y a pas que de la violence
avec des armes. Il y a des situations de violence".
Abbé Pierre.
<http://news2.nemoweb.net/?DataID=AyUxKB_gUqOdxWOlEj39LVjtuks@jntp>

Re: [SR] Relativistic wavelengths

<55BQ-xazs0-TZYVGdCRkUPAji6k@jntp>

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https://www.novabbs.com/tech/article-flat.php?id=82742&group=sci.physics.relativity#82742

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From: r.hac...@tiscali.fr (Richard Hachel)
 by: Richard Hachel - Sat, 19 Feb 2022 11:35 UTC

Le 18/02/2022 à 20:52, Richard Hachel a écrit :
> Le 18/02/2022 à 20:43, Richard Hachel a écrit :
>> <http://news2.nemoweb.net/jntp?TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp/Data.Media:1>
>>
>> In a given reference frame R, a small monochromatic light emits in the yellow.
>>
>> When O' crosses O, the position of the lamp forms an angle µ with the Ox axis
>> in R.
>>
>> 1. What will be the value of this angle in R'?
>>
>> 2. What will be the new observed monochromatic wavelength?
>>
>> Answers:
>>
>> cosµ'=(cosµ+v/c)/(1+cosµ.v/c)
>>
>> λ'=λ.sqrt(1-v²/c²)/(1+cosµ.v/c)
>>
>> <http://news2.nemoweb.net/?DataID=TfVdA6CR3h3GrgaJljFjPtuFuRo@jntp>
>>
>> R.H.
>
> And, obviously:
> x'=(x-v.to)/√(1-v²/c²)
> y'=y
> z'=z
> to'=(to-v.x/c²)/√(1-v²/c²)
>
> R.H.

"La théorie de la relativité est très simple, et il suffit de
maîtriser les racines carrées, les sinus, et les cosinus. Un moyen
élève de lycée peut y parvenir facilement. Pourtant les plus grands
pontes de la physique internationales n'y sont jamais parvenus, pourquoi?
Parce qu'elle est bourrée de petits pièges.
Pièges de référentiel, piège de signe, piège de pusillanimité,
piège de concept"

Prenons le piège de pusillanimité.

On n'ose pas.

Si l'on propose à un physicien relativiste d'employer simplement
l'équation x=1/2gt², il va entrer dans une terreur terriblement terrible
qui va le terroriser, et cela, c'est terrifiant.

"On peut pas! On peut pas!"

Mais si, on peut.

Faut juste comprendre de quoi on cause et pourquoi on peut le faire.

Simplement, il suffit de bien écrire les choses : Xo= 1/2 Gr Tr²

"The theory of relativity is very simple, and it is enough to master the
square roots, the sines, and the cosines. An average high school student
can achieve it easily. Yet the greatest pundits of international physics
are never there reached, why?
Because it is full of little traps.
Referential traps, sign trap, pusillanimity trap, concept trap"

Let's take the pusillanimity trap.

We dare not.

If we propose to a relativistic physicist to simply use the equation
x=1/2gt², he will enter into a terribly terrible terror which will
terrorize him, and that is terrifying.

"We can't! We can't!"

But yes, we can.

You just have to understand what we're talking about and why we can do it.

Simply, you just have to write things well: Xo= 1/2 Gr Tr²

<http://news2.nemoweb.net/?DataID=55BQ-xazs0-TZYVGdCRkUPAji6k@jntp>

R.H.

--
La plus belle chose, c'est l'amour.

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