1

New Theories / Re: Why light change its' speed and direction during refraction?

« on: Yesterday at 12:36:31 »

If I make an optical fibre out of glass with a refractive index of 1.5 and I send a flash of light down a kilometer of this cable, how long does it take the flash to reach the other end?
What is the speed of light in that glass?

If you use one of these sorts of things to measure the depth of a swimming pool, do you get the right answer?
https://www.toolstation.com/dewalt-dwht77100-xj-laser-distance-measure-30m/p67627?store=AG&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&mkwid=_dc&pcrid=&pkw=&pmt=&gclid=Cj0KCQjwl92XBhC7ARIsAHLl9ak1eLlUzABZzcj2kekc_LMN7C-ixh7mcv0xwXPE-UhtrNAlFav1mK0aAoEFEALw_wcB&gclsrc=aw.ds

2

New Theories / Re: what is temperature?

« on: Yesterday at 12:18:02 »

You can do it with a  conventional light source and a monochromator and collimator , but it's horribly inefficient.

But, in principle, you can do it.

Yet no one has come up with experimental results to determine if your principle is correct.

No.
Because every single experiment with light- all of them- every single one- has shown that you can change the light source and not affect the outcome as long as you maintain the polarisation, intensity and spectrum.

Every experiment where someone first did it with candle light or sunlight and which has subsequently been repeated using artificial light is a demonstration that your bizarre idea is wrong.

3

New Theories / Re: what is temperature?

« on: Yesterday at 01:17:32 »

Yes, I have.
I didn't need to think about it for very long before I realised the answer.

What's the answer?

In order to get "laser" cooling to work, you need to produce a beam of light with a very carefully defined wavelength.
That's relatively easy with a tuneable laser.
You can do it with a  conventional light source and a monochromator and collimator , but it's horribly inefficient.

But, in principle, you can do it.
So, do you now (a few days later than everyone else) understand that you do not need a laser to produce that sort of cooling, so that sort of cooling can't be anything to do with a negative electronic temperature in a laser?

4

New Theories / Re: what is temperature?

« on: Yesterday at 01:14:19 »

but has difficulties to explain some others.

Which?

5

New Theories / Re: what is temperature?

« on: Yesterday at 01:14:01 »

Can you think of some property of laser light that might explain why lasers are typically used for cooling and other light sources are not?
Here's a hint
Nd YAG 1064 nm
NeNe 632.8nm
HeCd  422 nm

Laser frequency and wavelength can be tuned at will, by changing the length of light-emitting cavity or its temperature.
Temperature can also change frequency of LED.
Incandescent light produces continuous spectrum. Prism or diffraction grating can be used to select desired frequency.

Good, you are apparently learning.
I wonder how long it will last.

6

New Theories / Re: what is temperature?

« on: 12/08/2022 18:53:31 »

Have you ever thought why can't we just simply replace the lasers in laser cooling with LED or other incoherent light sources?

Yes, I have.
I didn't need to think about it for very long before I realised the answer.
Now it's your turn.
Can you think of some property of laser light that might explain why lasers are typically used for cooling and other light sources are not?
Here's a hint
Nd YAG 1064 nm
NeNe 632.8nm
HeCd  422 nm

7

New Theories / Re: what is temperature?

« on: 12/08/2022 17:30:03 »

A laser differs from other sources of light in that it emits light which is coherent.

Again, this is in the "lies we tell to children" category.
Unlike  "laser" cooling, in the field of holography you actually need to concern yourself with coherence.
You can't really make holograms without coherent radiation. (Ok, technically, you can but it's doing things the hard way)
And yet, Gabor invented and demonstrated holography without using a laser.
https://en.wikipedia.org/wiki/Dennis_Gabor
So we know that the wiki article isn't entirely correct.

However, it is nearly correct.
By far the easiest way to get coherent light is to use a laser.
It would be very unusual to use any other source of coherent radiation in an experiment today.


But, here's the point you missed.
You do not need coherence to do "laser" cooling.

So why did you quote the (not entirely accurate) wiki article about something irrelevant?
Are you trolling, or did you just not understand?

8

New Theories / Re: what is temperature?

« on: 12/08/2022 17:14:41 »

What are the differences between laser and other light sources?

The difference is (1) irrelevant, and that's the point (2) the way in which the light is produced- by stimulated, rather than spontaneous emission.

Until it's confirmed experimentally,  your deduction will remain as a hypothesis.

Not really, no.
We know from other experiments that a photon is a photon is a photon.
If it has the same wavelength and polarisation it will act the same as any other photon with that wavelength and polarisation.

Did you not realise this?
I tried to explain it to you.
"There is no way for the atoms being cooled to know if the photons hitting them came from a laser or from some other source"
But it seems the point went over your head.

9

New Theories / Re: Why light change its' speed and direction during refraction?

« on: 12/08/2022 12:56:41 »

At least, they must be told where the model we told them fails.

OK, so tell us where the model fails.

10

New Theories / Re: Why light change its' speed and direction during refraction?

« on: 12/08/2022 12:55:57 »

With a lot of online sources, it's hard to decide

Who finds it hard to decide, and why?

11

Just Chat! / Re: Best oil for frying "fish n chips"?

« on: 12/08/2022 12:54:37 »

As a member of the Southern US Fish Frying Delegation, I agree with peanut or canola. I'd also include vegetable oil as an option.

You do know that peanut and canola are both examples of vegetable oils, don't you?

12

New Theories / Re: what is temperature?

« on: 12/08/2022 12:52:17 »

Or is it just your hypothesis?

No, it's a deduction.
There is no way for the atoms being cooled to know if the photons hitting them came from a laser or from some other source, is there?
So the idea that they might behave differently is a bit silly, isn't it?
So, once again, we are into the territory of you asking questions that would not be asked by anyone who understood the science.
so, once again, you are only proving your own lack of understanding.

Why do you keep doing this?

13

The Environment / Re: Is global warming man-made?

« on: 11/08/2022 21:19:19 »

No. Humans generate more CO2 in winter, not summer. That's what makes the Mauna Loa  data so  interesting: it suggests that CO2 is a thermometer, not a thermostat,

We have been here before.
The M-L data probably looked fairly similar before mankind evolved, a cyclic seasonal variation in CO2.
The difference we have made is that it's now superimposed on a slope that's going up faster than ever before.

CO2 isn't a thermostat; nobody said it was.

14

Physics, Astronomy & Cosmology / Re: Has the distance between the sun & earth changed?

« on: 11/08/2022 13:09:14 »

It's important to recognise that this is a joke.
https://www.pinterest.co.uk/pin/7388786872784819/

15

New Theories / Re: How does Noether's theorem apply to moments of time?

« on: 11/08/2022 08:46:57 »

I never do mistakes, i learn.

OK, both instances of the word "I" there should be a capital letter.
And the word "do" is incorrect, the correct word is "make".
You can't even tell us that you don't make mistakes without making  mistakes.

16

New Theories / Re: How does Noether's theorem apply to moments of time?

« on: 11/08/2022 08:42:32 »

The point remains; you don't understand Noether's theorem.

Perhaps me, perhaps you.
Whats the proof of that ?

The proof that you don't understand it is your inability to explain what symmetry corresponds to your suggested  "conservation of now".

17

New Theories / Re: How does Noether's theorem apply to moments of time?

« on: 10/08/2022 22:08:43 »

What insult ?

This sort of thing.

Dont call mommy.

(calling mommy is not an example)

But the interesting thing is that you don't seem to understand that you are insulting people.
Do you behave like that in real life?

18

New Theories / Re: How does Noether's theorem apply to moments of time?

« on: 10/08/2022 22:02:39 »

Dont try to fool me with such primitiv recursif trick.

So, you also don't know what recursive means.

The point remains; you don't understand Noether's theorem.

19

New Theories / Re: How does Noether's theorem apply to moments of time?

« on: 10/08/2022 20:22:54 »

What symmetry are you putting forward as the counterpoint to your idea that ""now" is conserved?

I dont say anything like that.
I only say that if you dont agree that Noether theorem states that there is some "now" within the block universe, then you are stupid.
You can say : Oh no ! i dont believe ! Or whatever you can say.
This will not change the fact (and i am totaly sure some non stupid guys will understand that; soon they read it).

I believe the usual meme here is "Tell me you don't understand Noether's theorem without saying you don't understand Noether's theorem".

20

Marine Science / Re: Can whales eat when they are in fresh water ?

« on: 10/08/2022 19:19:06 »

Do you really believe that vets enjoy euthanizing animals?

I dont believe, i only note that in France if we dont talk about dogs cats and horse (and even in that case they dont really care of the animal), every animal that is not actualy able to survive without help will be euthanized.
If a vet dont know how to help (because it would need some additional work) the animal to survive, he will euthanize it.
 

So, your preference would be to promote and prolong suffering.
Why would you do that?