A beam consisting of 50 eV electrons (electron mass 9.11 *10^-31 kg) is incident on a thin wafer of a crystal with layerspacing 4.6 Angstroms. Surprisingly we find that theelectrons, which are particles, are scattered in such a way as toform an interference pattern identical to that of a wave. What will be the distance between central interference maxima at adistance of 18 cm from the wafer?
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