Answer
$p = 1.7\times 10^{-24}~kg~m/s$
Work Step by Step
We can find the momentum:
$\lambda = \frac{h}{p}$
$p = \frac{h}{\lambda}$
$p = \frac{6.626\times 10^{-34}~J~s}{0.40\times 10^{-9}~m}$
$p = 1.7\times 10^{-24}~kg~m/s$
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