Final answer:
Different elements show different spectra, emitting light at specific wavelengths. Each element has its own characteristic set of spectral lines, based on the movement of electrons between unique orbits.
Step-by-step explanation:
True. Different elements show different spectra. When atoms or molecules are excited, they emit light at specific wavelengths, creating a unique set of spectral lines. Each element has its own characteristic set of lines, produced by electrons moving between their unique set of orbits. These spectral lines can be used to identify the composition of a substance or determine the elements present in a sample.