1. The problem statement, all variables and given/known data . Suppose an electron is in the spin state (a,B) If sy is measured, what is the probability of the result h/2? 2. Relevant equations Eigenvectors of the pauli matrix for y are (1,i)/Sqrt (1,-i)/Sqrt and if you are given a wave function of the sort a | +> +b |-> then the probability of getting state | +> is a^2/(a^2+b^2) 3. The attempt at a solution I wrote out (a,B) as a linear combination of the of the two eigenvectors for the pauli matrix and got that the probability of finding the electron with spin h bar/2 to be (|a-ib|^2)/2. I just want to check with all of you if that is right.