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The electron spin is placed in a fixed magnetic field B=B0, if the spin is in the z- direction spin-up quantum state when the spin

The electron spin is placed in a fixed magnetic field B=B0, if the spin is in the z- direction spin-up quantum state when the spin is at t=0, try to prove that the electron spin precesses around the x-axis (30%). If the external magnetic field B0 = 0.04 Tesla, what is the precession angular frequency?

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