Uncertainty principle?

A proton passes through a slit that has a width of 8.00 10-10 m. What uncertainty does this introduce in the momentum of the proton at right angles to the slit?
Update: A proton passes through a slit that has a width of 8.00x10^-10 m. What uncertainty does this introduce in the momentum of the proton at right angles to the slit?
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