In a line spectrum, what is represented?

In a line spectrum, specific frequencies of light are represented, which correspond to particular wavelengths emitted or absorbed by substances as they transition between different energy levels. Each line in the spectrum corresponds to a distinct energy transition of electrons within an atom or molecule. These transitions occur when an electron absorbs energy and moves to a higher energy level, or releases energy when returning to a lower energy state. As a result, the emitted or absorbed light creates sharp lines at specific frequencies or wavelengths, rather than a continuous spectrum.

This characteristic of line spectra allows scientists to identify elements and compounds based on the unique patterns of light they emit or absorb, making it an invaluable tool in fields such as spectroscopy and astrophysics for understanding the composition of distant stars and other celestial bodies.