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When are emission lines formed

The emission lines are at the exact frequencies of the absorption lines for a given An emission line is formed when the electron falls back to a lower energy. A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, By contrast, a bright emission line is produced when photons from a hot material are detected in the presence of a broad spectrum from a cold source. The emission spectrum of a chemical element or chemical compound is the spectrum of These emitted photons form the element's spectrum. The production of line spectra by the atoms of an element indicate that an atom can radiate only a.

Thus, emission spectra are produced by thin gases in which the atoms do not experience many collisions (because of the low density). The emission lines. Emission line galaxies. The stellar population of spiral galaxies is constantly refurnished by newly formed massive, bright and blue young main sequence stars. An emission line is produced by an atom in a ``excited'' energy statethe electron is not in as low an energy orbit as possible. Remember rule.

A spectral line is like a fingerprint that can be used to identify the atoms, elements or molecules present in a star, galaxy or cloud of interstellar gas. Spectral Line Formation. A given atom will Absorb and Emit the SAME frequencies of E-M radiation. So a gas of hydrogen will produce an absorption line. Today, we'll look at the processes by which emission and absorption lines are created. We'll also do a little bit of analysis, but leave most of it for a later day. These lines came to be known as 'spectral lines' and were cataloged by heating common elements until they produced light and measuring the wavelengths.