Question: Alpha particles are projected toward a gold foil from a distance that is sufficiently large to consider the Coulomb force negligible. The gold nuclei have

Alpha particles are projected toward a gold foil from a distance that is sufficiently large to consider the Coulomb force negligible. The gold nuclei have

118

neutrons and

79

protons. If a

2.60

MeV alpha particle has a scattering angle of

180

and the gold nucleus does not recoil, determine the distance of closest approach of the alpha particle.

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