A hydrogen atom in its ground state absorbs a single photon. As a result, the orbital angular momentum of its electron increases by $2\hbar$, where $\hbar = h/2\pi$. Use the Bohr model, take the ground-state energy as $-13.6\ \text{eV}$, and use $hc = 1240\ \text{eV nm}$. The wavelength of the absorbed photon is closest to