According to the Bohr model, what determines the shortest

Chapter 30, Problem 30.38

(choose chapter or problem)

According to the Bohr model, what determines the shortest wavelength in a given series of wavelengths emitted by the atom? (a) The quantum number ni that identifies the higher energy level from which the electron falls into a lower energy level (b) The quantum number nf that identifies the lower energy level into which the electron falls from a higher energy level (c) The ratio nf /ni, where nf is the quantum number that identifies the lower energy level into which the electron falls and ni is the quantum number that identifies the higher level from which the electron falls (d) The sum nf ni of two quantum numbers, where nf identifies the lower energy level into which the electron falls and ni identifies the higher level from which the electron falls (e) The difference nf ni of two quantum numbers, where nf identifies the lower energy level into which the electron falls and ni identifies the higher level from which the electron falls S