Question

The impact parameter $\left(b\right)$ is proportional to -

$\theta$ is scattering angle.

• A. $\cot \left(\theta /2\right)$
• B. $\tan \left(\theta /2\right)$
• C. $\cot \left(\theta \right)$
• D. $\tan \left(\theta \right)$

Answer 1

The correct option is A $\cot \left(\theta /2\right)$

The impact parameter $\left(b\right)$ is proportional to $\cot \left(\theta /2\right)$.

$\Rightarrow b\propto \cot \left(\theta /2\right)$

​​​​​​​Hence, option $\left(A\right)$ is the correct answer.