- #1

- 8

- 0

There is an external magnetic field along the positive z direction B = (0,0, B) and the initial spin direction at time t

Ŝ

where α

This initial spin pointing in the direction Ŝ

ψ(α

What are A and B?

For the Psi= A alpha + B beta part alpha and beta represent the |+> and |-> z sates respectively.

Hey everyone on this fine night,

I really don't know where to start and was wondering if someone could give me a push in the right direction? Is this just asking what is the probability of it being up or down? I really can't get my foot out of the door on this :(

_{0}= 0 is specified by the direction cosinesŜ

_{0}= (cos α_{0}, cos β_{0}, cos γ_{0})where α

_{0}, β_{0}, γ_{0}are the angles between the initial spin and the x, y, z axes, respectively.This initial spin pointing in the direction Ŝ

_{0}can be represented in terms of spin up and down states along z direction:ψ(α

_{0},β_{0},γ_{0}) = A(α_{0},β_{0},γ_{0})α + B(α_{0},β_{0},γ_{0}β ) ,What are A and B?

For the Psi= A alpha + B beta part alpha and beta represent the |+> and |-> z sates respectively.

Hey everyone on this fine night,

I really don't know where to start and was wondering if someone could give me a push in the right direction? Is this just asking what is the probability of it being up or down? I really can't get my foot out of the door on this :(

Last edited: