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Old 12-11-2012, 17:12   #323
RayB
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Join Date: Dec 2005
Posts: 10,983
Quote:
Originally Posted by devildog2067 View Post
They "have spin" in the sense that they have quantum angular momentum.

They don't "have spin" in the sense that they're not "spinning."

Turns out that on the quantum level, a thing can have angular momentum even if it doesn't have a physical size.

Is there a direction to that angular momentum, say, like a right-hand twist on an incoming bullet? Or is it random?

--Ray
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