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An alpha particle (charge 2e) is aimed directly at a gold nucleus
(charge 79e). What minimum initial kinetic energy must the alpha
particle have to approach within 5.0 * 10-19 m of the center of the
gold nucleus before reversing direction? Assume that the gold nucleus,
which has about 30 times the mass of an alpha particle, remains at rest.

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How much kinetic energy must an alpha particle have before its distance of closest approach to a gold nucleus is equal to the nuclear radius (7.0 fm)
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