[填空题]
What is the uncertain x(axkz6(;qt nty in the mass ofc c0dw77fel -qurv0 j+ a muon $(m=105.7 \, \text{MeV/c}^2)$, specified in $\text{eV/c}^2$, given its lifetime of $2.20 \times 10^{-6} \, \text{s}$? [Hint: $\Delta E \approx \hbar / \Delta t$ and $\Delta m = \Delta E / c^2$]
$\frac{\hbar}{\Delta t}$= $ \times 10^{-10}\ \text{eV}$
${\Delta m}$ = = $\times 10^{-10}\ \text{eV}$
