Fr.: équivalence masse-énergie
The principle of interconversion of mass and energy, described by the → mass-energy relation.
→ mass; → energy; → equivalence.
Fr.: relation masse-énergie
The famous equation proposed by Einstein as a consequence of his special theory of relativity describing the equivalence of mass and energy: E = mc2, where E is energy, m is the equivalent amount of mass, and c is the velocity of light.
Fr.: énergie mécanique
The energy that is possessed by an object due to its motion or due to its position. It is equal to the sum of the → kinetic energy and → potential energy.
→ mechanical; → energy.
Fr.: énergie nucléaire
Energy released during a nuclear reaction as the result of the conversion of mass into energy. → mass-energy equivalence.
Fr.: énergie orbitale
The → sum of the → potential energy and the → kinetic energy of an object in → orbit.
Fr.: énergie de parité
In nuclear physics, the extra binding energy associated with pairs of nucleons of the same kind. This quantity expresses the fact that nuclei with odd numbers of neutrons and protons have less energy and are less stable than those with even numbers of neutrons and protons.
Fr.: énergie de Planck
The unit of energy in the system of Planck units. EP = √ (ħ c5/G) ≅ 1.22 x 1019 GeV. It can also be defined as EP = ħ / tP, where tP is the Planck time. This is an extraordinarily large amount of energy on the subatomic scale and particle accelerators have yet to produce a particle with this magnitude of energy. Understanding the properties of a subatomic particle that contains the Planck Energy is helpful in developing a Unified Field Theory which encompasses the realms of Quantum Theory and Relativity, although this too has evaded complete scientific understanding.
Fr.: énergie potentielle
Of a system, the work done in changing the system from some standard configuration to its present state. Thus, if a body of mass m is raised vertically through a height h, the work done, mgh, is the increase in potential energy.
potential energy curve
xam-e kâruž-e tavand
Fr.: courbe de l'energie potentielle
A plot that displays the → potential energy of a moving body as a function of its position. It is explained by the → conservation of energy and the conversion of potential energy into → kinetic energy and vice versa.
Fr.: énergie radiative
The energy that is transmitted in the form of → radiation, in particular as → electromagnetic radiation.
Fr.: énergie au repos
The energy which a particle has when it is at rest. According to Einstein's → mass-energy relation, it is equal to the → rest mass times the square of the → speed of light: E = mc2.
kâruž-e jerm-e âram
Fr.: énergie au repos
Same as → rest energy.
Fr.: énergie de rotation
The → kinetic energy of rotational motion of an object. It is expressed by ER = (1/2)Iω2, where I is the → moment of inertia and ω → angular velocity (2π/P).
Fr.: énergie rotationnelle
The → kinetic energy due to the → rotation of and object. Rotational energy is part of the total kinetic energy of the body. It is given by: (1/2)Iω2, where I is the → moment of inertia and ω is the → angular velocity. Same as → angular kinetic energy.
→ rotational; → energy.
semiempirical binding energy formula
disul-e nime-ârvini-ye kâruž-e bandeš
Fr.: formule semi-empirique de l'énérgie de liaison
Same as → Weizsacker formula.
→ semiempirical; → binding; → energy; → formula.
Fr.: énergie de séparation
The energy required to remove a particle (a proton or a neutron) from a particular atomic nucleus.
→ separation; → energy.
Fr.: énergie acoustique
The energy which → sound waves impart to a medium. Same as acoustic energy.
spectral energy distribution (SED)
vâbâžeš-e kâruž-e binâbi
Fr.: distribution de l'énergie spectrale
A plot showing the energy emitted by a source as a function of the radiation
wavelength or frequency. It is used in many branches of astronomy to characterize
astronomical sources, in particular mainly in → near infrared
and → middle infrared to study
→ protostars or
→ young stellar objects. The SED of these objects is
divided in four classes.
→ spectral; → energy; → distribution.
splitting of energy level
fâqeš-e tarâz-e kâruž
Fr.: dédoublement d'un niveau d'énergie
The splitting of a single atomic level into a group of closely spaced levels when the substance producing the single line is subjected to a uniform magnetic field. → Zeeman effect; → Stark effect.
→ spliting; → energy level.
Fr.: énergie de supernova
The total amount of energy liberated by a → supernova. A typical supernova radiates between 1051 and 1052 → erg, or 1044-45 J (→ joules).