If an electron is moving in the $n^{th}$ orbit around the nucleus with a velocity $v$ and radius $r$,then the value of $n$ is .........

  • A
    $2\pi rmv/h$
  • B
    $2\pi rmv$
  • C
    $2\pi rv/mh$
  • D
    $2\pi rm/vh$

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