The alpha particles from a naturally radioactive decay have a kinetic energy of 4.25 MeV. How close does an alpha particle come within a gold nucleus if the particle is heading directly toward the nucleus? Give your answer in terms of number of radii of the gold atom, r = 7.0 fm.
A) 2
B) 8
C) 12
D) 15
E) 19
Correct Answer:
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