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Homework Help: Lennard-Jones Potential

  1. May 8, 2010 #1
    1. The problem statement, all variables and given/known data
    [PLAIN]http://img94.imageshack.us/img94/4287/len2.jpg [Broken]

    2. Relevant equations
    [PLAIN]http://img710.imageshack.us/img710/2428/len1y.jpg [Broken]


    3. The attempt at a solution
    I know my way around the Lennard-Jones potential formula, but this question stumps me.

    Any clues on how to proceed are greatly thanked!
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 8, 2010 #2
    Just define a new unitless variable as [itex]X=r/\sigma[/itex].
     
  4. May 9, 2010 #3

    I used your defined variable and plugged it in, but still cannot arrive at the proof given in the question, could you possibly expand further?

    Thank you!
     
  5. May 9, 2010 #4
    I wouldn't call that a proof. You are just doing a change of variables. You can replace [itex]r/\sigma[/itex] with [itex]X[/itex] in the above equation. Unless 'X' has a meaning that I am unaware of.
     
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