Theoretical physics -- where does spin 1/2 come in

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Pearly
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How did they figure out that particles have spin.where does spin 1/2 come in...how was that detected?
 
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The two big names here are Uhlenbeck and Goudsmit. Put "uhlenbeck goudsmit electron spin" into Google and you'll get lots of reading material. :cool:
 

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