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## Homework Statement

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

## Homework Equations

[tex]\Gamma\tau=\hbar[/tex]

## The Attempt at a Solution

No idea what this is really asking me. is it really just

[tex]\Gamma=\frac{\hbar}{\tau}[/tex]

assuming it's not because it gave the energy...