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

A proton and an alpha-particle are fired directly toward each

other from far away each with an initial speed of 0.01c.

Determine their distance of closest approach measured between

their centres.

2. Relevant equations

See below.

3. The attempt at a solution

What I did was..

Kinetic Energy of the system = Potential Energy of the system

(.5*m_{p}*v^{2}) + (.5*m_{He}*v^{2}) = k*q_{p}*q_{He}/ r

and then I solved for r, which gave me an incorrect answer.

What am I doing wrong?

I am just wondering.. could you please try this question and tell me what you get?

I get 1.16*10^{5}...

which is not the correct answer..

The correct answer is 19.2 fm.;;;

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Electric Potential Energy

**Physics Forums | Science Articles, Homework Help, Discussion**