Shift to renewable electricity a win-win at statewide level

Amid rollbacks of the Clean Power Plan and other environmental regulations at the federal level, several U.S. states, cities, and towns have resolved to take matters into their own hands and implement policies to promote ...

The fun way to manipulate atoms

With their potential to perform calculations far beyond the reach of conventional supercomputers, machines harnessing certain quantum physics phenomena are expected to change the way the world solves complex problems. They ...

X-ray imaging provides clues to fracture in solid-state batteries

Solid-state batteries—a new battery design that uses all solid components—have gained attention in recent years because of their potential to hold much more energy while simultaneously avoiding the safety challenges of ...

New York takes aim at skyscrapers' sky-high energy usage

It's a tall order indeed: How do you make aging, energy-hungry skyscrapers more efficient and less polluting? The city of New York, the historic capital of the skyscraper, is determined to do so by requiring the enormous ...

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Energy level

A quantum mechanical system or particle that is bound, confined spatially, can only take on certain discrete values of energy, as opposed to classical particles, which can have any energy. These values are called energy levels. The term is most commonly used for the energy levels of electrons in atoms or molecules, which are bound by the electric field of the nucleus. The energy spectrum of a system with energy levels is said to be quantized.

If the potential energy is set to zero at infinity, the usual convention, then bound electron states have negative potential energy.

Energy levels are said to be degenerate, if the same energy level is obtained by more than one quantum mechanical state. They are then called degenerate energy levels.

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