Final answer:
Atoms exposed to ultraviolet light can go through a process called fluorescence, where they absorb UV photons and emit light at a lower energy level.
Step-by-step explanation:
Atoms that are produced in the presence of ultraviolet light, which absorb UV photons and may emit light at lower energy levels, are involved in a process called fluorescence. When an atom absorbs a UV photon, it is excited to one of its higher energy levels. It can then de-excite by re-emitting photons in a single step or in multiple steps. If the atom de-excites in smaller steps, releasing energy that is different from the absorbed UV photon, this leads to fluorescence. Such fluorescent reactions are used in various applications, including black lights that cause materials to glow and in special microscopes to observe small details not visible with normal light. Ultraviolet light itself is a type of high-energy radiation that is invisible to the human eye but can cause chemical reactions that may be harmful to organisms.