An α particle is accelerated to a potential difference of 2 × 106 V from far away towards a nucleus with the atomic number 48. Assume that the trajectory of the alpha particle was head-on and there was no loss of any form of energy in between. The distance of the closest approach of the alpha particle to the nucleus will be -
1
3.456 × 10-14 m
2
1.728 × 10-14 m
3
1.728 × 10-15 m
4
3.456 × 10-15 m