Potential energy problem. help >.<

  • Thread starter hichangkyu
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An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.05e-11 m. What is EPEfinal - EPEinitial, which is the change in the electric potential energy?


Homework Equations



V=kq/r
PEfinal=qVfinal

The Attempt at a Solution



since initially, r was very big and V very small, you can consider the initial potential energy to be zero... right?

after that i calculated for V. V= (9.0e9)(-1.6e-19)/5.05e-11 = -28.5148.
what do i do from here? I multiplied by the charge of the electron again and got 4.5623e-18 but that's wrong?

any light that can be shed on this will be greaaaaaaaaatly appreciated. thanks! :smile:
 

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