25.31 In Rutherfords famous scattering experiments that led to the planetary model of the atom, alpha particles (charge + 2 e, mass = 6.6 x 10 - 27 kg) were fired at a gold nucleus (charge + 79 e). An alpha particle initiallly very far from the gold nucleus is fired at 2.0 x 107 m/s directly toward the center of the nucleus. How close does the alpha particle get to this center before turning around?
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