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Natural Science Forum / Physics / Relativity / April 2006I forget & I can't find what's a 1/2 spin, 0, 1, etc....
I forget & I can't find on the web what's a 1/2 spin, 0, 1, etc.... can anyone explain it as simple as possible so that I might continuously remember in the future? > I forget & I can't find on the web what's a 1/2 spin, 0, 1, etc.... can > anyone explain it as simple as possible so that I might continuously > remember in the future? Buy yourself a particle physics book or look them up in, http://pdg.lbl.gov/ FrediFizzx http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.pdf or postscript http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.ps http://www.vacuum-physics.com It would be a litttle difficult to imagine the particles with spin 1/2,-1/2 as it is a concept of sub atomic particles. Now suppose you have an arrow pointing in one direction ( <---- ). You start rotating it until it comes in it's orignal form. You'll realize that you have rotated 360 degrees. This arrow has spin =1. Now you have a double headed arrow, symmtrical. You rotate it until it comes in it's orignal form. But now you have to rotate it only 180 degrees as the arrow has two heads( <---> ) It has spin=2. Now there are particles that needs to be rotated twice (720 degrees) in order to get them in orignal form again. These particles exist in sub atomic world and have spin =1/2 > It would be a litttle difficult to imagine the particles with spin > 1/2,-1/2 as it is a concept of sub atomic particles. [quoted text clipped - 6 lines] > orignal form. But now you have to rotate it only 180 degrees as the > arrow has two heads( <---> ) Hard to imagine since your arrows are linear where as a spin is angular and I believe perpendicular to the particle's travel direction.... Spin = 1, I can picture a particle which has spun angularly at 360 degrees Spin = 2, I can't picture a 2 headed arrow *spinning* at 180 degrees apart, how can you spin in two opposite directions? = impossible....a spin is in one direction??? > It has spin=2. > Now there are particles that needs to be rotated twice (720 degrees) > in order to get them in orignal form again. > These particles exist in sub atomic world and have spin =1/2 > > It would be a litttle difficult to imagine the particles with spin > > 1/2,-1/2 as it is a concept of sub atomic particles. [quoted text clipped - 16 lines] > apart, how can you spin in two opposite directions? = impossible....a > spin is in one direction??? It has nothing to do with "spinning" at all. It's a rotational transformation. You're just rotating the double headed arrow either clockwise or counter clockwise. Since both ends of the arrow are indistinguishable, it only requires a rotation of 180 degs to bring it back to its original configuration. Unlike the single headed arrow, whose ends are distinguishable, and so it will take a full 360 degs to bring it back. > > > It would be a litttle difficult to imagine the particles with spin > > > 1/2,-1/2 as it is a concept of sub atomic particles. [quoted text clipped - 24 lines] > whose ends are distinguishable, and so it will take a full 360 degs to > bring it back. Ok but if you read what you wrote,it's a little brief. The subject is about particles, all your saying is these particles have arrows and transformations (360 degree transformation = spin1) and two headed arrow. If I tell someone this particle has a two headed arrow....he won't understand what it means and nor do I. If I tell someone this particle has a 360 degree transformation....and it has nothing to do with spin, he also won't understand what it means and nor do I. When I've answered the question I was not considering the particles. It was just an example. If you want to know more, go deeper in the subject where you can really understand what it means. In brief I can tell that it is a quantum number that restricts the number of electrons in an orbital to 2. > When I've answered the question I was not considering the particles. It > was just an example. If you want to know more, go deeper in the subject > where you can really understand what it means. In brief I can tell that > it is a quantum number that restricts the number of electrons in an > orbital to 2. I read the meaning of spin at Wikepedia, actually it's not that complex (unless I didn't read it properly) to explain. This quantum number is indeed related to its angular and azimutal degree of spin (as opposed to what Igor said), the amount of momentum of this spin, the single or multi-direction of this spin and if it's a mono, dual, quadropole or more.... Where as s =spin, the quantum number is determined by h sqrt(s(s+1). > > > > It would be a litttle difficult to imagine the particles with spin > > > > 1/2,-1/2 as it is a concept of sub atomic particles. [quoted text clipped - 36 lines] > it has nothing to do with spin, he also won't understand what it means > and nor do I. It is just an analogy. Particles don't literally have these arrows. They do have a wave nature and associated with that there are polarization states. The number of independent polarization states is intimately linked to spin. Beyond that, you might want to do some research of your own. It would be a litttle difficult to imagine the particles with spin 1/2,-1/2 as it is a concept of sub atomic particles. Now suppose you have an arrow pointing in one direction ( <---- ). You start rotating it until it comes in it's orignal form. You'll realize that you have rotated 360 degrees. This arrow has spin =1. Now you have a double headed arrow, symmtrical. You rotate it until it comes in it's orignal form. But now you have to rotate it only 180 degrees as the arrow has two heads( <---> ) It has spin=2. Now there are particles that needs to be rotated twice (720 degrees) in order to get them in orignal form again. These particles exist in sub atomic world and have spin =1/2 > I forget & I can't find on the web what's a 1/2 spin, 0, 1, etc.... can > anyone explain it as simple as possible so that I might continuously > remember in the future? The spin is just the quantum number. Multiplication by hbar gives the actual spin angular momentum value. guskz@hotmail.com: >I forget & I can't find on the web what's a 1/2 spin, 0, 1, etc.... can >anyone explain it as simple as possible so that I might continuously >remember in the future? http://www.google.com |
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