What is the significance of spectral lines

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Origin of spectral line First recorded in — Words nearby spectral line spectinomycin , Spector , spectra , Spectracef , spectral , spectral line , spectral luminous efficiency , spectral series , spectral type , spectra yellow , spectre.

How to use spectral line in a sentence Domestically, the prime minister maintains the dubious line that he is the only man who can keep the still-fragile peace. Blackwood's Edinburgh Magazine, No. January, Atoms prefer to be in their ground state, where all of the electrons are located as close to the nucleus as possible.

Absorption lines occur when an atom, element or molecule absorbs a photon with an energy equal to the difference between two energy levels.

This causes an electron to be promoted into a higher energy level, and the atom, element or molecule is said to be in an excited state. Emission lines occur when the electrons of an excited atom, element or molecule move between energy levels, returning towards the ground state.

The spectral lines of a specific element or molecule at rest in a laboratory always occur at the same wavelengths.