An alpha particle with kinetic energy 7' = 0.50 MeV is
deflected through an angle of 0 = 90∘ by the Coulomb field of a
stationary Hg nucleus. Find:
* All the formulas in this Part are given in the Gaussian system of units.
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(a) the least curvature radius of its trajectory;
(b) the minimum approach distance between the particle and the
nucleus.