Question

A beam of electrons with kinetic energy 50 eV strikes the surface of a NaCI crystal. The spacing between the planes of the crystal is 0.281 nm. At what angle to the surface do we see a maximum in the reflected electron beam? (You can assume the electrons are nonrelativistic, and therefore K - p2/2m.) The same beam of electrons impinges on a pair of slits. A first-order diffration maximum is seen at 30 degrees to the incoming electron direction. How far apart are the slits?

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