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•• Consider a proton confined to a region of typical nuclear dimensions, about 5 fm. (a) Use the uncertainty principle to estimate its minimum possible kinetic energy in MeV, assuming that it moves in only one dimension, (b) How would your result be modified if the proton were confined in a three-dimensional cube of side 5 fm? [See Eq. (6.40).] The actual kinetic energy of protons in nuclei is somewhat larger than this estimated minimum, being of order 10 MeV.
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