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Electron spin

Electron spin

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@metal-brain said
What exactly is being measured and why is it called "spin"?
We have already answered both questions.


@metal-brain said
What exactly is being measured and why is it called "spin"?
https://en.wikipedia.org/wiki/Spin_(physics)
https://en.wikipedia.org/wiki/Stern%E2%80%93Gerlach_experiment


@kazetnagorra said
https://en.wikipedia.org/wiki/Spin_(physics)
https://en.wikipedia.org/wiki/Stern%E2%80%93Gerlach_experiment
In other words, you are incapable of answering the question without referring me to jargon terms that don't explain anything.

What is being measured?

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@metal-brain said

What is being measured?
Spin.
Is that too much jargon for you?
Do you want us to dumb down "spin" for you?
We have already answered all your questions.

If you have insufficient intelligence to understand what wiki says, given it explains it about as clearly as it can be explained, we cannot dumb it down to your level so you can understand it and that's not our problem but yours. We understand it just fine, only you don't.
The way many of not most things wiki explains cannot be dumb down without making it too simplistic if not simply just plain wrong.


@metal-brain said
In other words, you are incapable of answering the question without referring me to jargon terms that don't explain anything.

What is being measured?
Spin couples to magnetic fields. This can be measured.


@Metal-Brain
You too are an arrogant Kaze. Why do you want to keep coming off so arrogantly? Do you think you are so smart you deserve recognition of your super abilities or some such?


@kazetnagorra said
Spin couples to magnetic fields. This can be measured.
Couples?
Is anything spinning or not?
You are claiming there is no speed. If there is no speed what is being measured? This is a simple question that deserves a clear answer. What is being measured?


@metal-brain said
Couples?
Is anything spinning or not?
You are claiming there is no speed. If there is no speed what is being measured? This is a simple question that deserves a clear answer. What is being measured?
What is being measured is the response to an applied magnetic field.


@kazetnagorra said
What is being measured is the response to an applied magnetic field.
That is not spin.

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@Metal-Brain
Duh. You are really stuck on spin. Get this: it is CALLED spin as a way to understand what is going on and not saying that is reality.
It could be just another kind of force field that ACTS like something is spinning but that is too much for you to take in.


@sonhouse said
@Metal-Brain
Duh. You are really stuck on spin. Get this: it is CALLED spin as a way to understand what is going on and not saying that is reality.
It could be just another kind of force field that ACTS like something is spinning but that is too much for you to take in.
Why not admit you have no idea? That would be the truth.
Nobody has ever seen an electron. How could anybody know what is really going on? Electron spin is a misleading term. Nobody knows if it is spinning or even if the wave function is spinning, although it is a good theory. That is what seems to happen in an electric wire. Isn't there something to spin after all? There is the right hand rule. Why is there no left hand rule?

https://en.wikipedia.org/wiki/Right-hand_rule


@metal-brain said
That is not spin.
Yeah it is.


@kazetnagorra said
Yeah it is.
Prove it.


@metal-brain said
Why not admit you have no idea? That would be the truth.
Nobody has ever seen an electron. How could anybody know what is really going on? Electron spin is a misleading term. Nobody knows if it is spinning or even if the wave function is spinning, although it is a good theory. That is what seems to happen in an electric wire. Isn't there something to spin after all? Ther ...[text shortened]... e right hand rule. Why is there no left hand rule?

https://en.wikipedia.org/wiki/Right-hand_rule
The reason that the magnetic moment of an electron implies that it has angular velocity is that Ampere's law that a current loop will produce a magnetic moment entails that if there is a magnetic moment there must be a current loop, since magnetic monopoles are ruled out in Maxwell's equations so there's no other known way to create the magnetic moment.

To explain spin properly we'd need to discuss representations of the rotation group, which is beyond what I think is achievable here. One needs to understand Lie Groups, what they tell us about physics and how that relates to the states available to an elementary particle.
Electron spin is a misleading term. Nobody knows if it is spinning or even if the wave function is spinning, although it is a good theory.

I disagree that spin is a misleading term, but your second sentence here is fine. What we expect of a theory is that it produces a good description of nature, since the objects under investigation are microscopic we are relying heavily on the mathematical formulation of the theory and experiment. The requirement is that the theory should predict outcomes of experiments well.

There are a number of consequences of elementary particles carrying intrinsic spin. There is a theorem called the Spin-Statistics Theorem which shows that in quantum field theories particles with half-integer spin are fermions and particles with integer spin are bosons. Because electrons have spin 1/2 and this means that they are fermions they can have two possible spin states, so each atomic orbital can have two electrons in it. This explains the periodic table.

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@metal-brain said
Prove it.
That request makes no sense.
Science defines that physical property as spin therefore its spin by definition.
Thus saying "Prove it" is as idiotic as saying "Prove all squares have 4 sides" and for the same kind of reason; It isn't a matter of proof because all squares have 4 sides by definition.
If you deny this then, OK, 'prove' to us science is wrong about spin and what it defines as spin isn't spin... If it isn't spin by definition, this should be a trivial task for you.

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