Principles of Quantum Mechanics · Problem 14.4.4

Addition of Angular Momenta — R. Shankar

Physics — Quantum Mechanics · spin-flip-time

Problem

At t=0t = 0, an electron is in the state with sz=ℏ/2s_z = \hbar/2. A steady field B=Bi^\mathbf{B} = B\hat{\mathbf{i}}, B=100B = 100 G, is turned on. How many seconds will it take for the spin to flip?

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