Spectroscopy and the Electromagnetic Spectrum Practice Test

An atom emits a photon when an electron drops from a higher energy level to a lower energy level. Emission of which type of electromagnetic radiation indicates the smallest energy-level spacing among the choices?

An excited atom can relax by emitting electromagnetic radiation in one of the following regions: infrared, visible, ultraviolet, or X-ray. The emitted photon energy depends on the size of the energy-level drop. Which region would correspond to the largest energy-level drop among the options listed?