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“barrier”
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“barrier”
(Latin: lock, barrier; to close, to shut; a confined space)
Word Entries containing the term:
“barrier”
Coulomb barrier
1. The electrostatic forces within the high potential energy region of a nucleus which prevents positively charged particles from reaching the nucleus of an atom.
2. Reactions between atomic nuclei are inhibited by the need for the nuclei to overcome the repulsive force that acts between any pair of similarly charged particles.
2. Reactions between atomic nuclei are inhibited by the need for the nuclei to overcome the repulsive force that acts between any pair of similarly charged particles.
At high temperatures, nuclei move sufficiently fast to be able to overcome the Coulomb barrier.
The greater the nuclear charge, the higher is the temperature that is required for nuclear reactions to occur.
sonic barrier, sound barrier
A sharp, sudden increase in aerodynamic drag on an aircraft approaching the speed of sound.
Historically perceived as a physical obstacle that might prevent an aircraft from traveling at speeds faster than the speed of sound.
This entry is located in the following unit:
sono-, son-, sona-, -sonous, -sonic, -sonically
(page 3)
thermal barrier
The speed limitation imposed on an aircraft by aerodynamic overheating.
This entry is located in the following unit:
thermo-, therm-, thermi-, -thermia, -therm, -thermal, -thermic, -thermias, -thermies, -thermous, -thermy
(page 19)
Word Entries at Get Words containing the term:
“barrier”
barrier energy
1. The energy given up by an electron in penetrating the cell barrier.
2. A measure of the electrostatic potential of the barrier.
2. A measure of the electrostatic potential of the barrier.
This entry is located in the following unit:
Photovoltaic Conversion Efficiency Terms +
(page 2)
barrier island
A landform created by long linear wave deposits that form parallel to shorelines.
This entry is located in the following unit:
Geography Terms +
(page 2)
barrier reef
A coral reef separated from the shoreline by a lagoon.
This entry is located in the following unit:
Geography Terms +
(page 2)
cell barrier
A very thin region of static electric charge along the interface of the positive and negative layers in a photovoltaic cell.
The barrier inhibits the movement of electrons from one layer to the other, so that higher-energy electrons from one side diffuse preferentially through it in one direction, creating a current and thus a voltage across the cell; also called depletion zone or space charge.
This entry is located in the following unit:
Photovoltaic Conversion Efficiency Terms +
(page 4)
Schottky barrier
A cell barrier, or junction between a layer, established as the interface between a semiconductor; such as, silicon, and a sheet of metal characterized by hot carriers.
Named for the German physicist Walter Hans Schottky (1886-1976).
This entry is located in the following unit:
Photovoltaic Conversion Efficiency Terms +
(page 18)