# Restmass, lifetime of a meson

[SOLVED] Restmass, lifetime of a meson

## Homework Statement

A $$\rho$$ meson is a highly unstable subatomic particle with a rest mass of 776 MeV/c^2 and a mean lifetime of $$4\times10^{-24}$$s. What is the minimum uncertainty in the meson's energy?

## Homework Equations

We know that rest energy of a particle E = mc^2, m being rest mass I'm assuming.

## The Attempt at a Solution

I don't even know where to begin. I'm not sure what they're asking, and what it is I need to calculate.