1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Simple question regarding spin

  1. Dec 14, 2006 #1
    Simple question regarding spin :)

    1. The problem statement, all variables and given/known data

    An electron is in spin state (superposition of spin eigenstates) given by the wavefunction: [tex]\chi=\frac{1}{3}\chi_+ + \frac{2\sqrt{2}}{3}\chi_-[/tex]. I need to find the probabilities that a measurement would find the electron with spin up or spin down.

    2. Relevant equations

    Uh.. you just square the coefficients, right? :)

    3. The attempt at a solution

    Probably a silly question but this seems too easy. I don't have this as a formula anywhere in my notes or book.. but to find the probability of spin up, you just square (1/3), and to find the probability of spin down, it's just the square of 2sqrt(2)/3... right?
  2. jcsd
  3. Dec 14, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    If it's properly normalized, that will do it.
  4. Dec 15, 2006 #3
    Thanks! :)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?