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Potential Energy of Two Atoms?

  • Thread starter baubletop
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  • #1
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Homework Statement


The potential energy of two atoms separated by a distance r may be written as:

U(r) = 4Uatomic * [(r0/r)12 - (r0/r)6]

>Given r0 = 4.0 Ao and Uatomic = -0.012795 eV, what is the distance at which there is no net force between the atoms? Express your answer in terms of Ao.

>What is the potential energy at the position where the net force is 0 N? Express your answer in terms of eV.

Homework Equations


The above equation.


The Attempt at a Solution


I tried using Coulomb's Law, but I don't know the charges so it's not very helpful. Finding the total energy is also not relevant since I don't know mass or velocity. I'm pretty stuck here. I know once I find the first part I can find the second part easily, but I feel like I'm overlooking something simple for the first part of the question.
 

Answers and Replies

  • #2
Doc Al
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Hint: What's the relationship between force and the potential function? (Use calculus.)
 
  • #3
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F = -dU/dr :) I tried it and it worked! Thanks for the hint!
 

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