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changed explanation that charge not number has physical dimesions otherwise it doesnt make sense
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edit approved Jul 6, 2012 at 19:47
Xitcod13
edit approved Jul 6, 2012 at 19:47
Xitcod13
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As a answer, first I'd like to ask why you're asking a quantum mechanics problem with classical mechanics mental model.

There are two types of angular momentum in quantum mechanics:

  1. Orbital angular momentum, which is a generalization of angular momentum in classical mechanics (L=r×p). I think, you shouldn't have problem with this because Orbital has size.

  2. Spin, which has no analogue in classical mechanics. You can understand it as a number appeared in quantum equation. It can be understood like charge, which is a number (with physical dimension) to, which is a number to denote one of basic attributes of particles. Yes, Spin does have physical dimension of angular momentum. But, its because it is a type of angular momentum, mathematically.

As a answer, first I'd like to ask why you're asking a quantum mechanics problem with classical mechanics mental model.

There are two types of angular momentum in quantum mechanics:

  1. Orbital angular momentum, which is a generalization of angular momentum in classical mechanics (L=r×p). I think, you shouldn't have problem with this because Orbital has size.

  2. Spin, which has no analogue in classical mechanics. You can understand it as a number appeared in quantum equation. It can be understood like charge, which is a number (with physical dimension) to denote one of basic attributes of particles. Yes, Spin does have physical dimension of angular momentum. But, its because it is a type of angular momentum, mathematically.

As a answer, first I'd like to ask why you're asking a quantum mechanics problem with classical mechanics mental model.

There are two types of angular momentum in quantum mechanics:

  1. Orbital angular momentum, which is a generalization of angular momentum in classical mechanics (L=r×p). I think, you shouldn't have problem with this because Orbital has size.

  2. Spin, which has no analogue in classical mechanics. You can understand it as a number appeared in quantum equation. It can be understood like charge(with physical dimension), which is a number to denote one of basic attributes of particles. Yes, Spin does have physical dimension of angular momentum. But, its because it is a type of angular momentum, mathematically.

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Earth is a Spoon
Earth is a Spoon
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As a answer, first I'd like to ask why you're asking a quantum mechanics problem with classical mechanics mental model.

There are two types of angular momentum in quantum mechanics:

  1. Orbital angular momentum, which is a generalization of angular momentum in classical mechanics (L=r×p). I think, you shouldn't have problem with this because Orbital has size.

  2. Spin, which has no analogue in classical mechanics. You can understand it as a number appeared in quantum equation. It can be understood like charge, which is a number (with physical dimension) to denote one of basic attributes of particles. Yes, Spin does have physical dimension of angular momentum. But, its because it is a type of angular momentum, mathematically.