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Homework Help: Quantum States

  1. Apr 5, 2008 #1
    1. The problem statement, all variables and given/known data

    The quantum state of a particle can be specified by giving a complete set of quantum numbers (n, l, m_s, m_l) . How many different quantum states are possible if the principal quantum number is n = 2?

    To find the total number of allowed states, first write down the allowed orbital quantum numbers l, and then write down the number of allowed values of m_l for each orbital quantum number. Sum these quantities, and then multiply by 2 to account for the two possible orientations of spin.

    2. Relevant equations

    3. The attempt at a solution

    since n = 2
    then l = 0,1
    m_l for l = 0 --> 0
    m_l for l = 1 --> -1,0,1
    then I added them up, which is 6
    and then multiply it by 2, which is 12.

    but I got wrong..
    please help me..
  2. jcsd
  3. Apr 5, 2008 #2
    it's ok.. I got it.. :)
  4. Apr 5, 2008 #3
    can you show me?!
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