Question

what subatomic particle causes spectral lines in emission spectra diagrams, like the one shown below? (b) h₂ emission spectrum (top), h₂ absorption spectrum (bottom) electrons protons quarks neutrons

Explanation:

When electrons in an atom transition from a higher - energy state to a lower - energy state, they emit photons of specific energies corresponding to the differences in energy levels. These emitted photons create the spectral lines in emission spectra. Protons, neutrons, and quarks are not directly involved in this process of creating spectral lines in emission spectra.

Answer:

electrons