# Quantum Mechanics: Probablities

1. Feb 18, 2015

### Robben

Suppose we have a spin$-1$ particle in a certain state $|\phi\rangle$ under the $S_z$ basis. How do you find the probabilities that a measurement of $S_z$ will result in the values of $\hbar,0,$ or $-\hbar$?

Also, what does it mean exactly when it says what is the probability that $S_x$ will result in the value of $\hbar$ in this state?

2. Feb 20, 2015

### vanhees71

Could it be that this question should be put to the homework section of these forums?