Answer
$ 3.08\times10^{-10}\,m$
Work Step by Step
Recall: $\Delta x\times m\Delta v=\frac{h}{4\pi}$
$\implies \Delta x=\frac{h}{4\pi m\Delta v}$
$=\frac{6.626\times10^{-34}\,J\cdot s}{4\times3.14\times9.11\times10^{-31}\,kg\times1.88 \times10^{5}\,m/s }$
$=3.08\times10^{-10}\,m$
