Spectral lines
principle · 1814 · Industrial Revolution
Fraunhofer lines; the “fingerprints” of elements.
Author: William Hyde Wollaston.
Principles and materials it uses
- Spectroscope — uses. They are observed with a spectroscope.
- Quantum mechanics — uses. Explained by quantum theory.
Where it is used
- Atomic clock — is used in. The second is defined by the frequency of an atomic transition.