A helium nucleus (4
2He) is travelling at a speed of 7 x 106 ms-1
towards a gold nucleus
(197
79 AU). By considering only electrostatic forces, calculate the closest possible distance of
approach between the two particles.
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Alpha particle scattering animation
6x10-19)]/5.5x10-13 = 6.6x10-14 m. This is well inside the atom but some eight nuclear diameters from the centre of the gold nucleus.
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