Chapter 7 - Electronic Structure - Questions and Exercises - Exercises - Page 286: 7.48

$7.27\times10^{5} m/s$

v = $\frac{h}{mλ}$ h = $6.626\times10^{-34}Js$ m = $9.109\times10^{-31} kg$ λ = 1.00 nm = $1.00\times10^{-9}m$ v = $\frac{6.626\times10^{-34}Js}{9.109\times10^{-31} kg\times1.00\times10^{-9}m}$ = $7.27\times10^{5}m/s$