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

[richyw]

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...

 

[mfb]

Is the energy used in any follow-up question?
Otherwise, I think it is irrelevant. Lifetime alone gives the energy spread.

 

[richyw]

nope, it was a single question. Guess it was a trick. Thanks.