Linked Questions

34 votes
3 answers
3k views

Is spin really just "rest angular momentum"? [duplicate]

Spin is the intrinsic angular momentum of a particle. The particle itself is elementary and is not spinning on its axis, and has this momentum even at rest. The absolute magnitude of this momentum ...
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6 votes
6 answers
762 views

Why does the electron not spin? [duplicate]

The goto answer to that question is that the electron is a pointlike particle and cannot spin. The electron is not pointlike though. It is described by a wavefunction. One can prepare the wavefunction ...
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  • 180
3 votes
2 answers
1k views

What is meant by the spin of a particle? [duplicate]

I have been studying that electrons have quantum number called spin quantum number(s), this number can have either +1/2 or -1/2 value. If s=+1/2, the spin is clockwise and if s=-1/2, the spin is anti ...
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  • 295
5 votes
1 answer
1k views

What does it mean for a particle to have spin of 2? [duplicate]

When I first started to study quantum mechanics, my physics text book told that particles have spin of either 1/2 or -1/2. Then I recently read an article saying that gravitons are expected to be ...
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  • 140
2 votes
1 answer
376 views

How does an isolated electron in deep space 'know' it is spinning? [duplicate]

This is a question about Mach's principle. Why is Mach's principle still an open question? In particular, if inertia arises from distant matter, Mach's principle raises the question would a particle ...
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2 votes
2 answers
595 views

How to explain spin of electron? [duplicate]

How can we explain spin of electron, or the spin of other fundamental particles? If we think the spin of electron is similar to the spin of a ball or planet we make a mistake. We say it is an ...
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0 votes
1 answer
151 views

Why do photons have spin of 1 when they have no mass? [duplicate]

How can a photon have a spin of $1$ when it has no mass? Since the spin is intrinsic angular momentum, if $m = 0$, then the spin must be zero.
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  • 109
0 votes
1 answer
548 views

Why do particles have spins such as $1/2$, $3/2$, $5/2$? [duplicate]

What does it mean to have 'half' spin? I have looked on Wikipedia and a few youtube videos on spin but they don't explain what it means to have $1/2$ spin. I am 18 and only starting to learning about ...
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  • 1,630
1 vote
2 answers
222 views

How can electrons spin if they have no volume? [duplicate]

My understanding of electrons is that they have no volume, eg they are point particles. If this is true, how can a point spin?
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-1 votes
2 answers
204 views

What does Quantum Spin Cause? [duplicate]

How do particles with different Quantum Spin Numbers interact differently with other matter? What does spin cause? I understand that electrons etc act as if they are spinning my emitting a magnetic ...
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1 vote
0 answers
399 views

Difference between classical spin and quantum spin [duplicate]

What is the difference between classical spin and quantum spin?
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0 votes
1 answer
305 views

how can a particle can have a spin of 2 [duplicate]

i have seen some analogies of spin using playing cards but i am struggling to grasp the concept due to this making no sense in terms of playing cards
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  • 407
0 votes
1 answer
340 views

What exactly is quantum spin? [duplicate]

What is "spin" as it relates to subatomic particles? I've heard that it's similar to angular momentum but I've also heard that's not completely the case.
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  • 1,591
-1 votes
2 answers
300 views

How can spin be angular momentum and particles dimensionless? [duplicate]

On the Wikipedia page it says that spin is a form of angular momentum. Wikipedia also say particles are dimensionless. However if particles are actually "dimensionless" there would be no way to deduce ...
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  • 1,591
1 vote
3 answers
162 views

What is particle spin in terms of waves? [duplicate]

If particles are waves, then what really is spin?
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