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 

  • [AIPMT 2009]
  • A

    directly proportional to $Z_1 Z_2$ 

  • B

    inversely  proportional to $Z_1$ 

  • C

    directly proportional to $m_1\times m_2 $ 

  • D

    directly proportional to mass  $m_1 $ 

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