# 931.5 conversion factor

1. May 22, 2012

### goodcow

Hi, could someone explain why $1amu=931.5MeV/c^2$? Thanks

2. May 22, 2012

### Staff: Mentor

1. Look up the conversion factor between amu and kg.

2. Recall that E = mc2.

3. Finally, look up the conversion factor between joules and electron volts (eV).

3. May 22, 2012

### goodcow

Thank you: I see how it works now