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Van der Waals'

  1. Aug 13, 2009 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations



    3. The attempt at a solution

    I think Graphite is a Van der Waals' Solid and, er, salt would be an ionic.
    But I really don't have much of a clue about what the second part is going on about!

    Thanks! :)
     

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  2. jcsd
  3. Aug 13, 2009 #2
    Can't see the attachment yet. While Coulomb interaction dominate the interplay between electrons in graphite, I do believe the force holding the layers together could be referred to as van der Waals.
     
  4. Aug 14, 2009 #3
    The second part is asking you for the variation of potential (attractive term) with respect to the distance between the particles, so for the van der Waals' forces, the Lennard-Jones potential applies, while for the ionic forces, the Coulomb potential applies. This would give [tex]\beta[/tex] as 6 for the former and 1 for the latter.
     
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