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Homework Help: Angular momentum

  1. Apr 23, 2009 #1
    1. The problem statement, all variables and given/known data
    Show that [ Lk , r^2] = 0

    2. Relevant equations

    3. The attempt at a solution
    know that L=r x p=r x(-ih(bar)V)
  2. jcsd
  3. Apr 23, 2009 #2


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    Homework Helper

    With the k I take it you mean the third component?

    Lets write it like this [Lz,r^2]=[Lz,x^2+y^2+z^2]=[Lz,x^2]+[Lz,y^2]+[Lz,z^2]. Can you work out these three commutators?
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