Science, Spectroscopy, Physics, Chemistry, Light.
“Absorption Spectrum (Emission Spectrum Lines) (Article).” Khan Academy, Khan Academy, www.khanacademy.org/science/class-11-chemistry-india/xfbb6cb8fc2bd00c8:in-in-structure-of-atom/xfbb6cb8fc2bd00c8:in-in-bohr-s-model-of-hydrogen-atom/a/absorptionemission-lines.