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±(ei2 |t) + ein/2 |1)) describes the precession
-iot/2
4
The quantum mechanical state y(t)) =
1)+ e'
motion of an electron within a magnetic field aligned along the +z-axis. At t =0, the spin of the
electron is in the positive x-direction. For t> 0, calculate the probability for measuring the angular
momentum of the particle to be (a) ħ/2 along the z-direction, and (b) ħ/2 along the x-direction.

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