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**URGENT - Quantum help needed!**

## Homework Statement

A beam of neutrons with known momentum is diffracted by a single slit. SHow that an approximate value of the component of momentum of the neutrons in a direction perpendicular to both the slit and the incident beam can be derived from the single-slit diffraction pattern.

## Homework Equations

## The Attempt at a Solution

No idea how to do this really.. Why would the neutrons have a momenum component in that direction anyway?