Homework Statement
The Hamiltonian for a spin-half particle is
H = 2a/ħ (Sx + Sy)
where a is a positive constant and Sx , Sy are the x and y components of the spin. Initially (at time t=0) the particle is in the state
|ψ> = (1/√2) (|↑>+|↓>)
where up and down arrows denote...