The rows of atoms on the surface of a crystal are separated by a distance of 0.352 nm. A beam of electrons is accelerated through a potential difference of 175 V and is incident normal to the surface. At what angle relative to the incident beam would the first-order diffracted electron beam be found?

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The rows of atoms on the surface of a crystal are separated by a distance of 0.352 nm. A beam of electrons is accelerated through a potential difference of 175 V and is incident normal to the surface. At what angle relative to the incident beam would the first-order diffracted electron beam be found?
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