Which of the following electronic transitions in a hydrogen atom will require the largest amount of energy?

  • A
    from $n=1$ to $n=2$
  • B
    from $n=2$ to $n=3$
  • C
    from $n=1$ to $n=\infty$
  • D
    from $n=3$ to $n=5$

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[Planck's constant $h=6.626 \times 10^{-34} \ J \ s$; velocity of light $c=3 \times 10^8 \ m \ s^{-1}$; $1 \ eV = 1.6 \times 10^{-19} \ J$]

The ratio of the energy of the electrons in the ground state of hydrogen to the electrons in the first excited state of $Be^{3+}$ is:

Which of the following equations gives the angular momentum of an electron in a stationary orbit?

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