Answer
$3.97\cdot 10^{-12}\text{m}$
Work Step by Step
$\lambda=\dfrac{h}{p}=\dfrac{6.63\cdot 10^{-34}\text{Js}}{10^5\text{m} \text{s}^{-1} \cdot 1.67\cdot 10^{-27}\text{kg}}=3.97\cdot 10^{-12}\text{m}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.