Let $r, v, E$ be the radius of orbit, speed of electron, and total energy of electron respectively in a $H$-atom. Which of the following quantities, according to Bohr theory, is proportional to the quantum number $n$?

  • A
    $vr$
  • B
    $rE$
  • C
    $\frac{r}{E}$
  • D
    $\frac{r}{v}$

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