Answer:
Both the \[\alpha \]-particle and nucleus are positively charged. When an \[\alpha \]-particle approaches a nucleus, its kinetic energy gradually changes into potential energy due to repulsive forces. At the distance of closest approach \[{{r}_{0}}\], the entire kinetic energy changes into potential energy. This concept can be used to calculate \[{{r}_{0}}\] , which gives the order of the size of the nucleus.
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