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energy level
NOUN
1.
a comparative level of capacity for vigorous activity: The child has a high energy level.
2.
Physics. one of a quantized series of states in which matter may exist, each having constant energy and separated from others in the series by finite quantities of energy.
Source: Dictionary.com
energy level | Define energy level at Dictionary.com
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en.wikipedia.org/wiki/Energy_level

A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy. This contrasts with classical particles, which can have any energy. These discrete values are called energy levels. The term is commonly used for the energy levels of electrons in atoms, ions, ...

en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Energy_Levels

As an electron approaches a nucleus from infinity, it becomes 'bound' - it is attached to the nucleus, if you like. In this bound state, the electron occupies what is ...

en.wikipedia.org/wiki/Degenerate_energy_levels

In quantum mechanics, an energy level is degenerate if it corresponds to two or more different measurable states of a quantum system. Conversely, two or more ...

www.khanacademy.org/science/physics/quantum-physics/atoms-and-electrons/v/atomic-energy-levels

the way I understand it is that all things in the universe try to move towards a situation of least energy. Let a ball go and it falls or rolls down a hill so that potential ...

www.nyu.edu/classes/tuckerman/adv.chem/lectures/lecture_5/node7.html

The Bohr model: An early attempt to predict the energy levels of an atom. It is observed that hydrogen will absorb and emit light at only discrete wavelengths as  ...

www.britannica.com/science/energy-state

Such configurations are also called energy levels; the atom, or system, is said to undergo a transition between two energy levels when it emits or absorbs energy  ...

smartsite.ucdavis.edu/access/content/user/00002774/Sears-Coleman%20Text/Text/C41-45/41-3.html

Instead, each atom has a set of possible energy levels. An atom can have an amount of internal energy corresponding to any one of these levels, but it cannot  ...

physics.nist.gov/cgi-bin/ASBib1/ELevBib.cgi

6 days ago ... References contained in this database are from Bibliography on Atomic Energy Levels and Spectra, NBS Special Publication 363 and ...