Be as descriptive as possible in the process of solving the problem
1.- There´s a particle of spin 1/2 of which the spatial degrees of freedom are neglected.
2.- At the instant t = 0 the square angular momentum is measured simultaneously and its third component of a particle “u” is obtained respectively 2 and + ħ. At time t = L1 is measured and + ħ is obtained.
Now if is measured again. What is the probability P ( = ħ) of obtaining + ħ as a result?
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