# Electron Positron pair

1. Jan 4, 2015

### arpon

1. The problem statement, all variables and given/known data
The antiparticle of electron is positron, whose mass is the same as electrons, i.e. $9.1 * 10^{-31} kg$ but the charge is opposite. What is the minimum energy required to produce a electron-positron pair?

2. Relevant equations

$E = mc^2$

3. The attempt at a solution
Actually I thought, it would be just $E = mc^2$. But the answer doesn't match.

2. Jan 4, 2015

### ShayanJ

You should calculate the energy required to produce a pair of particles i.e. two particles with equal masses!

3. Jan 4, 2015

### arpon

$2*mc^2$ ?

4. Jan 4, 2015

Yeah!