CUET · PHYSICS · PYQ PAPER 2025
The impact parameter for an \(\alpha\)-particle approaching a target nucleus is minimum when the scattering angle \(\theta\) is
- A 0
- B \((\pi / 4) rad\)
- C \((\pi / 2) rad\)
- D \((\pi ) rad\)
Answer & Solution
Correct Answer
(D) \((\pi ) rad\)
Step-by-step Solution
Detailed explanation
\(b \propto \cot(\theta/2)\) For minimum \(b\), \(\cot(\theta/2) = 0\). \(\theta/2 = \pi/2\) \(\theta = \pi\)
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