An alpha particle of energy `5 MeV` is scattered through `180^(@)` by a found uramiam nucleus . The distance of appreach is of the order of

An alpha particle of energy 5 MeV is scattered through 180^(@) by a found uramiam nucleus . The distance of closest approach is of the order of

An alpha particle of energy 5 MeV is scattered through 180^(@) by a fixed uranium nucleus. The distance of the closest approach is of the order of ........