How is impact parameter related to the scattering angle?

What is the impact parameter at which the scattering angle is 90^@ of rZ=79 and alpha particle of initial kinetic energy of 10 MeV.

Define impact parameter?

How is bit rate related to sampling rate?

What is impact parameters for scattering by 180^@ ?

How is evaporation related to humidity ?

Calculate the impact parameter of 5 MeV alpha particle scattered by 10^@ ,when it approaches a gold nucleus.