Browse the dictionary
842 terms · page 27 of 36
Quantum Hall Effect
A quantum mechanical version of the Hall effect observed in 2D electron gases at low temperatures and intense magnetic fields, where Hall…
Quantum & Atomic PhysicsQuantum Harmonic Oscillator
The quantum mechanical analogue of a classical harmonic oscillator, describing a particle bound in a parabolic potential well V(x) = ½ m ω²…
Quantum & Atomic PhysicsQuantum Operators
Linear mathematical operators that act on a wave function to yield physical observables (such as position, momentum, or energy).
Quantum & Atomic PhysicsQuantum Superposition
A core principle of quantum mechanics stating that a quantum system can exist in a linear combination of multiple distinct quantum states…
Quantum & Atomic PhysicsQuantum Tunneling
A quantum phenomenon where a particle passes through a potential energy barrier higher than the particle's kinetic energy.
Nuclear & Particle PhysicsQuark Flavor
The quantum property that distinguishes the six fundamental types of quarks in the Standard Model.
Plasma PhysicsQuark-Gluon Plasma (QGP)
A extreme phase of quantum chromodynamic (QCD) matter where hadrons melt into a deconfined state of free quarks and gluons at extreme…
Nuclear & Particle PhysicsQuarks
Fundamental spin-1/2 elementary particles that experience all four fundamental interactions and combine via the strong force to form…
Astrophysics, Cosmology & RelativityQuasar
An extremely luminous Active Galactic Nucleus (AGN) powered by gas accreting onto a supermassive black hole at the center of a distant…
Plasma PhysicsQuasi-neutrality
The property of a plasma where positive ion charge density and negative electron charge density are nearly equal across spatial scales…
Biophysics & Medical PhysicsRadiation Dosimetry
The subfield of medical physics quantifying and measuring ionizing radiation energy deposited in human tissues or phantom materials.
Geophysics & Environmental PhysicsRadiative Forcing
The net change in Earth's energy balance per unit area at the tropopause due to an environmental driver of climate change.
Nuclear & Particle PhysicsRadioactive Decay
The spontaneous process by which an unstable atomic nucleus loses energy by emitting ionizing radiation (particles or electromagnetic rays).
Nuclear & Particle PhysicsRadioactive Tracer
A chemical compound containing a radioisotope used to trace chemical or biological pathways through living organisms or industrial systems.
Biophysics & Medical PhysicsRadiobiology
The study of the biological mechanisms and health effects of ionizing radiation acting on living cells and biological tissues.
Nuclear & Particle PhysicsRadiocarbon Dating
A radiometric dating method that measures the residual decay activity of Carbon-14 in organic materials to determine their age up to…
Plasma PhysicsRadiofrequency Plasma Heating
A method of heating fusion plasma by launching high-power electromagnetic waves tuned to particle cyclotron or hybrid resonance frequencies.
Geophysics & Environmental PhysicsRadiometric Dating in Geology
A geochronological technique used to determine the absolute age of rocks and minerals by measuring radioisotope parent-to-daughter ratios.
Biophysics & Medical PhysicsRadiopharmaceuticals
Pharmaceutical compounds containing radioactive isotopes administered to patients for target-specific diagnostic imaging or therapy.
Biophysics & Medical PhysicsRadiotherapy
The clinical treatment of malignant cancer tumors using precisely targeted ionizing radiation beams to induce double-strand DNA damage in…
Classical MechanicsRadius of Gyration
The radial distance from a rotation axis at which total mass could be concentrated without altering the moment of inertia.
Geophysics & Environmental PhysicsRadon Gas Migration
The environmental migration of radioactive Radon-222 gas from decaying uranium in rocks and soil into indoor building spaces.
OpticsRainbow Formation
An optical meteorological phenomenon caused by reflection, refraction, and chromatic dispersion of sunlight inside raindrops.
Foundations of PhysicsRandom Error
Unpredictable, non-repeatable fluctuations in experimental measurements that occur with equal probability in either direction.