Assertion (A) : The force of repulsion between atomic nucleus and a-particle varies with distance according to inverse square law.
Reason(R) : Rutherford did alpha-particle scattering experiment.
Answer & explanation
Correct answer: option 2
Rutherford confirmed the repulsive force on alpha-particle due to nucleus varies with distance according to inverse square law and that the positive charges are concentrated at the centre and not distributed throughout the atom.