According to the Bohr model, what determines the shortest wavelength in a given series of wavelengths emitted by the atom?

• A

  The quantum number $n_{\mathrm{i}}$ that identifies the higher energy level from which the electron falls into a lower energy level.
• Correct answer
  B

  The quantum number $n_{\mathrm{f}}$ that identifies the lower energy level into which the electron falls from a higher energy level.
• C

  The ratio $\raisebox{1ex}{$n_{\mathrm{f}}$}\!\left/ \!\raisebox{-1ex}{$n_{\mathrm{i}}$}\right.$, where $n_{\mathrm{f}}$ is the quantum number that identifies the lower energy level into which the electron falls and $n_{\mathrm{i}}$ is the quantum number that identifies the higher level from which the electron falls.
• D

  The sum $n_{\mathrm{f}}+n_{\mathrm{i}}$ of two quantum numbers, where $n_{\mathrm{f}}$ identifies the lower energy level into which the electron falls and $n_{\mathrm{i}}$ identifies the higher level from which the electron falls.

Hence, the correct answer is option: 'B'.