In the Bohr model of the hydrogen atom, an electron moves in a circular orbit around a proton under the influence of the Coulomb force, with quantized angular momentum given by \(L = n\hbar\), where \(n\) is the principal quantum number. Let \(f_1\) be the electron's orbital frequency in the ground state (\(n = 1\)) and \(f_2\) be its orbital frequency in the first excited state (\(n = 2\)). What is the ratio \(f_1 / f_2\)?