Which of the following statements about nuclear forces is not true?
- The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometres.
- The nuclear force is much weaker than the Coulomb force.
- The force is attractive for distances larger than 0.8 fm and repulsive if they are separated by distances less than 0.8 fm.
- The nuclear force between neutron-neutron, proton-neutron and proton-proton is approximately the same.
(ii) The nuclear force is much weaker than the Coulomb force .