What is the de-Breglie wave length of a dust particle of mass $1.0 \times 10^{-9}\;kg$ drifting with a speed of $2.2ms^{-1}$? $(h= 6.6 \times 10^{-34}\;Js)$

Question

$\begin{array}{1 1} 3 \times 10^{-24}\;m \\ 3 \times 10^{-24}\;Km \\ 3 \times 10^{24}\;m \\ 3 \times 10^{24}\;Km \end{array}$