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Wave on a String
Wave on a String

The Mole - TeacherWeb
The Mole - TeacherWeb

Bourdel-3 (doc, 273 KiB)
Bourdel-3 (doc, 273 KiB)

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Lesson7
Lesson7

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Population inversion

In science, specifically statistical mechanics, a population inversion occurs while a system (such as a group of atoms or molecules) exists in a state with more members in an excited state than in lower energy states. It is called an ""inversion"" because in many familiar and commonly encountered physical systems, this is not possible. The concept is of fundamental importance in laser science because the production of a population inversion is a necessary step in the workings of a standard laser.
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