(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A proton is fired from far away towards a Hg nuclide.

Determine the distance of closest approach of the proton to the

centre of the nuclide when the initial speed of the proton is

4.0 * 10^{7}m/s.

(Answer: 13.8 fm)

2. Relevant equations

(1/2)mv^{2}= kqq/r

3. The attempt at a solution

I plug the numbers straight in and solve for r to get 3.113 * 10^-15, which is totally different from the correct answer above. (For mercury charge, I used 80e since mercury has 80 protons.)

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# Electric Potential (Potential Energy)

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