Answer:
The symbol \['b'\] represents impact parameter and \['\theta '\] represents the scattering angle. (i) When\[\theta ={{0}^{\circ }}\], the impact parameter b is large and the \[\alpha \]-particle passes almost undeflected. (ii) When \[\theta \simeq \pi \] n radians, the impact parameter b = 0 and the \[\alpha \]-particle is reversed back along its original path.
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