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Homework Help: Approximate Values of Kinetic Energy and Potential Energy

  1. Nov 4, 2015 #1
    1. The problem statement, all variables and given/known data
    The figure shows a potential energy curve for the interaction of two neutral atoms. The two-atom system is in a vibrational state (i.e., a total energy state) indicated by the heavy solid horizontal line.
    At r=r1, what are the approximate values of the kinetic energy K, the potential U, and the quantity K+U?

    2. Relevant equations
    Vibrational State = K + U

    3. The attempt at a solution
    I'm pretty sure that U = -1.2 (dotted line)
    And the Vibrational State (bold line) or K + U = -0.4
    Which I'd assume means that K = 0.8 but this is incorrect. I've looked at this inside out and cannot figure out what's wrong.

    Attached Files:

  2. jcsd
  3. Nov 5, 2015 #2


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    Looks right to me.
  4. Nov 5, 2015 #3
    I see what my mistake was. I was putting my answer in J but they wanted it in eV.
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