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Lowest-order correction for the bendulum

  1. Feb 27, 2009 #1
    what is the lowest-order correction to the ground state for the pendulum with small angle?
     
  2. jcsd
  3. Feb 27, 2009 #2
    [tex]cos(x)=1-x^2/2!+x^4/4!-...[/tex]
    [tex]\delta E\propto<\Psi_0\mid x^4\mid\Psi_0>[/tex]
     
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