The difference between the radii of $n^{\text{th}}$ and $(n+1)^{\text{th}}$ orbits of a hydrogen atom is equal to the radius of the $(n-1)^{\text{th}}$ orbit of hydrogen. The angular momentum of the electron in the $n^{\text{th}}$ orbit is $.........$ ($h$ is Planck's constant).

  • A
    $\frac{h}{\pi}$
  • B
    $\frac{2h}{\pi}$
  • C
    $\frac{3h}{\pi}$
  • D
    $\frac{4h}{\pi}$

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