Chapter 7 - Sections 7.1-7.6 - Exercises - Problems by Topic - Page 331: 56

$3.08\times10^{-10}\,m$

$\Delta x\times m\Delta v=\frac{h}{4\pi}$ $\implies \Delta x=\frac{h}{4\pi m\Delta v}$ $=\frac{6.626\times10^{-34}\,Js}{4\times3.14\times9.109\times10^{-31}\,kg\times1.88\times10^{5}\,m/s}$ $=3.08\times10^{-10}\,m$