According to Bohr's theory,the angular momentum of an electron in the $5^{th}$ orbit is ....... (in $h/\pi$)

  • A
    $1.0$
  • B
    $10$
  • C
    $2.5$
  • D
    $25$

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The deflection of a few $\alpha$-particles when bombarded on a thin gold foil indicates that $.......$

How many spectral lines are obtained when an electron transitions from the $8^{th}$ orbit to the $1^{st}$ orbit in a hydrogen atom?

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