# Calculate the energy spread of the Fe-57 first excited state

## Homework Statement

Calculate the energy spread of the 57Fe first excited state, which has energy 14.4 keV and lifetime 141 ns.

## Homework Equations

$$\Gamma\tau=\hbar$$

## The Attempt at a Solution

No idea what this is really asking me. is it really just
$$\Gamma=\frac{\hbar}{\tau}$$
assuming it's not because it gave the energy...