84. In order for the αparticle to penetrate the gold nucleus, the separation between the centers of mass of the two particles must be no greater than r = rCu+ r= 6.23 fm + 1.80 fm = 8.03 fm. Thus, the minimum energy Kis given by ()AuAu0919615148.99 10 V m/C 279 1.60 10C
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