Question

Alpha particle collision with nucleus what is impact parameter

Answer 1

In the case of head on collision, the impact parameter is zero and the electrostatic repulsive force is strongest; so alpha particle rebounds back or it suffers 180° ...

Answer 2

Impact parameter :

The perpendicular distance between initial direction of velocity of alpha particle to center of nucleus.

☆As impact parameter increases angle of scattering decreases.

☆ The impact parameter will be zero when the angle of scattering is 180°