Answer
833 pm
Work Step by Step
λ = $\frac{h}{mv}$
h = $6.626\times10^{-34}Js$
m = $\frac{1.008g}{6.022\times10^{23}} = 1.674\times10^{-27}kg$
v = $475 ms^{-1}$
λ = $\frac{6.626\times10^{-34}Js}{1.674\times10^{-27}kg\times475ms^{-1}}$ = $8.33\times10^{-10}m$ = 833 pm