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## Homework Statement

The antiparticle of electron is positron, whose mass is the same as electrons, i.e. [itex] 9.1 * 10^{-31} kg [/itex] but the charge is opposite. What is the minimum energy required to produce a electron-positron pair?

2. Homework Equations

2. Homework Equations

[itex]E = mc^2[/itex]

## The Attempt at a Solution

Actually I thought, it would be just [itex]E = mc^2[/itex]. But the answer doesn't match.