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With what velocity should an $\alpha$ particle travel towards a Cu nucleus so as to arrive at a distance of $10^{-13}$ m? [closed]

I attempted to calculate the force between the particles, which at a distance of $10^{-13}$ meters came out to be $8.352\times 10^{18}\, N$ using the formula $F = k\frac{q_1q_2}{r^2}$. How shall I go ...
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Phase shifts in scattering theory

I have been studying scattering theory in Sakurai's quantum mechanics. The phase shift in scattering theory has been a major conceptual and computational stumbling block for me. How (if at all) does ...