Why can't two laser beams collide?

[Olga]

They could be massless but how do you confirm that? I weigh about 197 lbs and you want to weigh me to check.
I get on your scale and I weigh zero, that is because your scales begin at 1000kg.
So you develop different scales because you do not believe i weigh nothing.
Now your lowest measurement, your lower bound is 100kg and you are very happy because you have improved your accuracy by a factor of ten.
I get on, I still weigh nothing.

This is where physicists are right now, their instruments are extremely sensitive BUT you cannot weigh zero and you cannot weigh something that is beyond the limit of your instrumentation.

Да какие проблемы, Пин? Я могу навесить на вас несколько десятков гирь, каждая по 80 кг., допустим, и в сумме вы будете весить больше 1000 кг. Потом просто уберите себя, и посмотрите, сколько кг. останется на весах.

 

[Olga]

What about Einstein's E=mc sqr? The whole point is that if you have mass then you cannot travel at c right?
That's what I thought too.
Turns out that is not necessarily true, my details are fuzzy, I would have to consult with a complicated thread on another forum.
From memory it got tricky.

Просто у света точка привязки маленькая.

 

[Pinball1970]

Да какие проблемы, Пин? Я могу навесить на вас несколько десятков гирь, каждая по 80 кг., допустим, и в сумме вы будете весить больше 1000 кг. Потом просто уберите себя, и посмотрите, сколько кг. останется на весах.

How do you provide 80Kg weights? You can only measure 1000Kg.

Also, not really the point I was making Olga.

 

[Olga]

How do you provide 80Kg weights? You can only measure 1000Kg.

Also, not really the point I was making Olga.

Ну, вы можете знать заранее, что эта гиря весит 80 кг.

 

[Pinball1970]

Ну, вы можете знать заранее, что эта гиря весит 80 кг.

Olga I am putting you in the instrumentation part of physics. They do not have 80Kg weights they only have 100kg presently.
If the photon is less than what they can weigh then it is either nought OR beyond the scope of the instruments.

 

[Pinball1970]

Ну, вы можете знать заранее, что эта гиря весит 80 кг.

There could be a theoretical limit like a Planck length? Not sure. 9.52 × 10-46 kilograms is pretty light that's 0.000000000000000000000000000000000000000000000000952 grams.

 

[Olga]

Olga I am putting you in the instrumentation part of physics. They do not have 80Kg weights they only have 100kg presently.
If the photon is less than what they can weigh then it is either nought OR beyond the scope of the instruments.

Ну, Пин, тогда придётся отожраться до 100 кг. Чего не сделаешь ради науки!

 

[DaveC426913]

That is, two counter-directed photons do not exhibit magnetic attraction to each other, and photons flying in parallel in the same direction do not exhibit magnetic repulsion from each other, in your opinion?

In my ... opinion?? These are facts.

Photons are not magnetically charged.

 

[DaveC426913]

And how can they be in the same place at the same time?

Because that's how bosons behave.

If you want to go further down the rabbit hole, we can start talking about half integer and whole integer particle spin.

 

[Olga]

In my ... opinion?? These are facts.

Photons are not magnetically charged.

Фотоны создаются попеременно магнитным и электрическим полем(если вам так привычней, называть это полем). Заряда постоянного у них нет.

 

[James R]

The answer is: the only thing that stops particles from passing through each other is Pauli's Exclusion Principle...

As has already been pointed out, the repulsion between like electrical charges is also very important, especially at the level of atoms and molecules.

 

[James R]

Pin, aren't photons massless? And how can they be in the same place, at the same time?

As far as we know, photons are massless. As Pinball said previously, experiments are consistent with photons having zero mass or a very tiny mass. There is an upper limit on how much mass a photon could possibly have, determined experimentally.

Why do they pass through each other?

As has previously been pointed out, photons are bosons. They are spin 1 particles, unlike electrons, neutrons and protons, which are all spin 1/2 particles.

Bosons can happily exist in the same state at the same time, which includes being in the same place as the same time.

Photons carry no electrical charge, so they do not attract or repel each other electrically or magnetically. They do not feel the strong force or the weak force. Therefore, they can be in the same place at the same time and they don't interact when they are in the same place at the same time. Therefore, they can pass through one another.

Photons are created alternately by a magnetic field and an electric field (if you are more accustomed to calling it a field). They do not have a constant charge.

They are created when electrically charged particles accelerate.

They have a constant charge: constantly zero charge.

 

[Olga]

As far as we know, photons are massless. As Pinball said previously, experiments are consistent with photons having zero mass or a very tiny mass. There is an upper limit on how much mass a photon could possibly have, determined experimentally.

As has previously been pointed out, photons are bosons. They are spin 1 particles, unlike electrons, neutrons and protons, which are all spin 1/2 particles.

Bosons can happily exist in the same state at the same time, which includes being in the same place as the same time.

Photons carry no electrical charge, so they do not attract or repel each other electrically or magnetically. They do not feel the strong force or the weak force. Therefore, they can be in the same place at the same time and they don't interact when they are in the same place at the same time. Therefore, they can pass through one another.

They are created when electrically charged particles accelerate.

They have a constant charge: constantly zero charge.

причина их ускорения - магнитное поле (вакуум). Он же - причина их движения вообще. Неужели, вы наконец таки поняли, как возникает скорость света, и почему она не бесконечна?

 

[DaveC426913]

the reason for their acceleration is the magnetic field (vacuum). It is also the reason for their movement in general. Have you finally understood how the speed of light arises, and why it is not infinite?

None of this is sensical.

 

[Olga]

None of this is sensical.

Смысла вообще ни в чём нет.

 

[DaveC426913]

There is no point in anything at all.

I didn't say there is no point; I said what you posted is non-sensical.

If you want to talk about there being 'no point in anything at all' the Philosophy forum would be a better place.

But if you want to talk about Science an Technology, this is the right place. But what you wrote is neither science nor technology.

 

[Olga]

I didn't say there is no point; I said what you posted is non-sensical.

If you want to talk about there being 'no point in anything at all' the Philosophy forum would be a better place.

But if you want to talk about Science an Technology, this is the right place. But what you wrote is neither science nor technology.

Дэйв, в этом был бы смысл, если бы вы дополняли свои утверждения доказательствами, а не просто что то постулировали. Я вам не могу с телефона картинку нарисовать, чтобы вы поняли, что я имею ввиду. А вы понимаете мои фразы неправильно. Трудно объяснять что то "на пальцах".

 

[DaveC426913]

Dave, this would make sense if you supported your statements with evidence, and not just postulated something.

I'm not the one postulating that photons are affected by magnetic fields.

I'm simply informing you of standard physics as it's understood today.

Futhermore, I'm not in the business of teaching you standard physics. You have pretty basic questions, that can easily be answrrs by a quick Google or visit to Wki on the subject.

I can't draw you a picture from my phone so that you understand what I mean. And you understand my phrases incorrectly. It's hard to explain something "on your fingers".

We have established, historically, that physics is not your strong suit.

Maybe, rather than trying to come up with your own ideas, you could start by reading up little on what the science actually says.

This is, after all, the Science and Tech forum, not the Alt Theories forum. If you want to wax poetic on your favourite ideas of magnetic photons, that would be a good place to do it.

 

[Olga]

I'm not the one postulating that photons are affected by magnetic fields.

I'm simply informing you of standard physics as it's understood today.

Futhermore, I'm not in the business of teaching you standard physics. You have pretty basic questions, that can easily be answrrs by a quick Google or visit to Wki on the subject.



We have established, historically, that physics is not your strong suit.

Maybe, rather than trying to come up with your own ideas, you could start by reading up little on what the science actually says.

This is, after all, the Science and Tech forum, not the Alt Theories forum. If you want to wax poetic on your favourite ideas of magnetic photons, that would be a good place to do it.

Дэйв, вы плохо знаете историю. Исторически сложилось так, что физика - это моё всё. Просто вы учили физику средних веков, а я современную.

 

[DaveC426913]

Dave, you don't know history well. Historically, physics is my everything. You just studied medieval physics, and I studied modern physics.

You can say that all you want - but it is not reflected in your conversation.

I will go with the manifestation of your physics acumen over your boasting.

I don't think anyone here is fooled, and I dont know why you try; it makes you look dishonest.