Terms starting with R
49 terms · page 2 of 3
Relative Biological Effectiveness (RBE)
The ratio of absorbed dose of a reference 250 kVp X-ray beam to the absorbed dose of a test radiation type required to produce an identical…
Geophysics & Environmental PhysicsRelative Humidity
The ratio of the actual vapor pressure of water in an air parcel to the saturation vapor pressure at the same temperature, expressed as a…
Astrophysics, Cosmology & RelativityRelativistic Kinetic Energy
The work required to accelerate a massive particle from rest to a relativistic velocity v.
Astrophysics, Cosmology & RelativityRelativistic Momentum
The linear momentum of an object moving at relativistic speeds, scaled by the Lorentz factor γ.
Plasma PhysicsRelativistic Plasma
A high-energy density plasma where thermal electron energies approach or exceed rest mass energy (511 keV), requiring relativistic plasma…
Astrophysics, Cosmology & RelativityRelativistic Time Dilation
The phenomenon where time passes slower for a clock in relative motion compared to a stationary observer's reference clock.
Geophysics & Environmental PhysicsRemote Sensing in Geophysics
The acquisition of geophysical information about Earth's surface and atmosphere from a distance using satellite or airborne sensors.
Nuclear & Particle PhysicsRenormalization
A mathematical technique in quantum field theory used to handle divergent infinite loop integrals by re-expressing parameters in terms of…
Foundations of PhysicsReproducibility
The requirement that an experimental finding can be independently duplicated by other researchers using the same procedures.
OpticsResolving Power
The ability of an optical instrument or grating to separate and distinguish two closely spaced point objects or adjacent spectral…
Waves, Oscillations & AcousticsResonance
The phenomenon where an oscillating system driven at its natural frequency absorbs maximum energy, resulting in large-amplitude vibrations.
Classical MechanicsRestoring Force
A force that acts to bring a body back toward its stable equilibrium position whenever it is displaced.
Foundations of PhysicsResultant Vector
The single combined vector that produces the exact same net physical effect as two or more individual vectors acting simultaneously.
Waves, Oscillations & AcousticsReverberation
The persistence of sound in an enclosed space caused by multiple continuous reflections from room boundaries after the original source…
Plasma PhysicsReversed Field Pinch (RFP)
A toroidal magnetic confinement device in which the toroidal magnetic field self-reverses direction near the outer edge of the plasma…
Thermodynamics & Statistical PhysicsReversible Process
An idealized thermodynamic process that can be reversed by infinitesimal changes in system variables without leaving any net trace on…
Classical MechanicsReynolds Number
A dimensionless quantity in fluid mechanics predicting flow patterns, equal to ratio of inertial forces to viscous forces.
Geophysics & Environmental PhysicsRichter Scale
A base-10 logarithmic scale quantifying earthquake magnitude based on the maximum amplitude of seismic waves recorded on a seismograph.
Electromagnetism & ElectronicsRL Circuit
An electrical circuit containing resistors and inductors, characterized by an exponential delay in current growth and decay governed by…
Electromagnetism & ElectronicsRLC Circuit & Resonance
An electrical circuit containing a resistor, inductor, and capacitor whose total impedance reaches a minimum at the resonant frequency.
Electromagnetism & ElectronicsRMS Current
The Root-Mean-Square value of an alternating current (AC), representing the equivalent direct current (DC) that delivers equal average…
Classical MechanicsRotational Kinetic Energy
The kinetic energy possessed by a body due to its rotation about an axis.
Mathematical & Computational PhysicsRound-off Error
The difference between the exact mathematical value of a function and the value computed using finite-precision floating-point arithmetic.
Mathematical & Computational PhysicsRunge-Kutta Methods
A family of iterative numerical integration algorithms used to solve ordinary differential equations with high accuracy.