What is the distance of closest approach...

What is the distance of closest approach to the nucleus for an `alpha`-particle of energy 5J MeV which undergoes scattering in the Gieger-Marsden experiment.

`3.2xx10^(-16)` m

`3.8xx10^(-14)` m

`4.6xx10^(-15)` m

`3.2xx10^(-15)` m

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