# Homework Help: Moon exchange particle

1. Nov 9, 2014

### Peoriakid123

1. The problem statement, all variables and given/known data
If an exchange particle held the moon together, what would the mass of the exchange particle be?

2. Relevant equations
Well, I know that the range of an exchange particle is as follows: $R=\frac{\hbar}{2mc}$ where m is the mass of the exchange particle and c is speed of light, hbar is 1.054e-34.
3. The attempt at a solution
I do not fully understand what a range is....how can I apply a range to this problem? If I could figure that out, i think I would be able to figure the problem out

2. Nov 10, 2014