How are line emission spectra produced?

Line emission spectra are produced when atoms or molecules absorb energy and then release it as they return to a lower energy state. This process occurs when electrons in an atom become excited to higher energy levels and, upon returning to their original states, emit photons of specific wavelengths. Each element has a unique set of energy levels, resulting in distinct spectral lines. These lines appear as a series of colored lines on a dark background when light from the excited atoms is analyzed, revealing the composition of the substance.