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 P: 3 Well, the magnitude of the vectors seems to be 1. After all, |(1 0)|2 is 1. So that would be okay? For the second question I used the Pauli-spinmatrix of Sx: h (0 1) 4pi (1 0) Then, I can use det(Sx-lambda*I) = 0 to get lambda2-1 = 0 so lambda is either 1 or -1. Using that in the eigenvalue equation I get Sx*v = +/- v Which gets me to h (0 1)(a) = +/- (a) 4pi (1 0)(b) (b) Which is equal to h (b) = +/- (a) 4pi (a) (b) Which in my view is only solvable for a = b = 0. ?