In a Rutherford scattering experiment when a projectile of charge Z 1 and mass M 1 approaches a target nucleus of charge Z 2 and mass M 2 , the distance of closest approach is r 0 . The energy of the projectile is :

1. A. Directly proportional to mass M 1
2. B. Directly proportional to M 1 M 2
3. C. Directly proportional to Z 1Z 2
4. D. Inversely proportional to Z 1

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