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Power transferred per unit area
In physics and many other areas of science and engineering the intensity or flux of radiant energy is the power transferred per unit area, where the area
Intensity_(physics)
Topics referred to by the same term
meter (W/m2) Intensity (physics), the name for irradiance used in other branches of physics (W/m2) Radiance, commonly called "intensity" in astronomy
Light_intensity
Topics referred to by the same term
(disambiguation) Intensity (physics), power per unit area (W/m2) Field strength of electric, magnetic, or electromagnetic fields (V/m, T, etc.) Intensity (heat transfer)
Intensity
Scientific field of study
the field of physics is called a physicist. Physics is one of the oldest academic disciplines. Over much of the past two millennia, physics, chemistry,
Physics
Intensity of electromagnetic radiation
(W·sr−1·nm−1). Radiant intensity is distinct from irradiance and radiant exitance, which are often called intensity in branches of physics other than radiometry
Radiant_intensity
Topics referred to by the same term
Radiant flux, the total power emitted by a source. Used in radiometry Intensity (physics), power per unit area (sometimes also called flux) Alfred William
Flux_(disambiguation)
Emission of electrons when electromagnetic radiation hits a material
Schaum's Outline of Modern Physics (2nd ed.). McGraw-Hill. pp. 60–61. ISBN 0-07-024830-3. Zhang, Q. (1996). "Intensity dependence of the photoelectric
Photoelectric_effect
Value of a vector-valued field
In physics, field strength refers to a value in a vector-valued field (e.g., in volts per meter, V/m, for an electric field E). For example, an electromagnetic
Field_strength
Potential for two waves to interfere
In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Even for wave
Coherence_(physics)
Amount of energy transferred or converted per unit time
to Power (physics). Wikiquote has quotations related to Power (physics). Simple machines Orders of magnitude (power) Pulsed power Intensity – in the radiative
Power_(physics)
unsolved problems grouped into broad areas of physics. Some of the major unsolved problems in physics are theoretical, meaning that existing theories
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
in Physics (Swedish: Nobelpriset i fysik) is awarded annually by the Royal Swedish Academy of Sciences to scientists in the various fields of physics. It
List of Nobel laureates in Physics
List_of_Nobel_laureates_in_Physics
Gradual loss of flux intensity through a medium
In physics, attenuation – colloquially, damping – is the gradual loss of flux intensity through a medium. For instance, dark glasses attenuate sunlight
Attenuation
Physics experiment
made it necessary to go beyond classical physics and take into account the quantum nature of light. A low-intensity double-slit experiment was first performed
Double-slit_experiment
bandwidth. Shot noise Intensity noise in Encyclopedia of Laser Physics and Technology Relative Intensity Noise in Encyclopedia of Laser Physics and Technology
Relative_intensity_noise
Power carried by sound waves
Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area
Sound_intensity
Concept in quantum mechanics
electron intensity are shown on the right, first for each slit individually, then with both slits open. With either slit open there is a smooth intensity variation
Wave–particle_duality
Topics referred to by the same term
percussionist Don Moye Dense (film), a 2004 film Dense set Concentration Flux Intensity (physics) This disambiguation page lists articles associated with the title
Density_(disambiguation)
Type of electric lamp/bulb
High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten
High-intensity_discharge_lamp
Physical process by which matter takes up a photon's energy and stores it
In physics, absorption of electromagnetic radiation is how matter (typically electrons bound in atoms) takes up a photon's energy—and so transforms electromagnetic
Absorption (electromagnetic radiation)
Absorption_(electromagnetic_radiation)
International System of Units ISO 31 Elert, Glenn. "Special Symbols". The Physics Hypertextbook. Retrieved 4 August 2021. NIST (16 August 2023). "SI Units"
List of common physics notations
List_of_common_physics_notations
Quantum correlations related to wave-particle duality
In physics, the Hanbury Brown and Twiss (HBT) effect is any of a variety of correlation and anti-correlation effects in the intensities received by two
Hanbury Brown and Twiss effect
Hanbury_Brown_and_Twiss_effect
history of quantum mechanics is a fundamental part of the history of modern physics. The major chapters of this history begin with the emergence of quantum
History_of_quantum_mechanics
Scale for rating tornado intensity
Fujita–Pearson scale (FPP scale), is a retired scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures
Fujita_scale
Process by which atoms or molecules acquire charge by gaining or losing electrons
calculations do not provide acceptably accurate results. However, when the laser intensity is sufficiently high, the detailed structure of the atom or molecule can
Ionization
optical circuit Integrating sphere Intense Pulsed Neutron Source Intensity (physics) Intensive and extensive properties Interacting boson model Interaction
Index_of_physics_articles_(I)
Concept in physics and chemistry
discontinuities is considered. A transmission coefficient describes the amplitude, intensity, or total power of a transmitted wave relative to an incident wave. Different
Transmission_coefficient
Phenomenon resulting from the superposition of two waves
In physics, interference is a phenomenon in which two coherent waves are combined by adding their intensities or displacements with due consideration for
Wave_interference
Physical constant in quantum mechanics
received the 1918 Nobel Prize in Physics "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta"
Planck_constant
List of tornadoes in the highest tornado intensity scales
tornado intensity scales. These scales – the Fujita scale, the Enhanced Fujita scale, the International Fujita scale, and the TORRO tornado intensity scale
List of F5, EF5, and IF5 tornadoes
List_of_F5,_EF5,_and_IF5_tornadoes
Non-invasive therapeutic technique
High-intensity focused ultrasound (HIFU), or MR-guided focused ultrasound surgery (MR-guided focused ultrasound ablation), is an incisionless therapeutic
Focused_ultrasound
Light scattering by small particles
the preference for blue light, nor could atmospheric dust explain the intensity of the sky's color. In 1871, Lord Rayleigh published two papers on the
Rayleigh_scattering
Hungarian–German physicist (1862–1947)
Hungarian–German experimental physicist who received the Nobel Prize in Physics in 1905 for his work on cathode rays. This work led to his experimental
Philipp_Lenard
1925 physics article by Werner Heisenberg
to the work other physicists made at the same time. In classical physics, the intensity of each frequency of light produced in a radiating system is equal
Umdeutung_paper
Interference phenomenon of waves
there are multiple closely spaced openings, a complex pattern of varying intensity can result. Other types of apertures or obstacles lead to different patterns
Diffraction
Branch of particle physics concerning interactions between two photons
Two-photon physics, also called gamma–gamma physics, is a branch of particle physics that describes the interactions between two photons. Normally, beams
Two-photon_physics
Black hole created from highly concentrated energy
cannot occur in any realistic scenario within our universe. While the intensity needed to directly verify this calculation is 50 orders of magnitude higher
Kugelblitz_(astrophysics)
Attraction of masses and energy
In physics, gravity (from Latin gravitas 'weight'), also known as gravitation or a gravitational interaction, is a fundamental interaction, which may
Gravity
Probability of a given process occurring in a particle collision
In physics, the cross section is a measure related to the probability that a specific process will take place in a collision of two particles. For example
Cross_section_(physics)
Application of physics in medicine or healthcare
Medical physics deals with the application of the concepts and methods of physics to the prevention, diagnosis and treatment of human diseases with a
Medical_physics
Earthquake off the coast of Iwate Prefecture, Japan
in Iwate and Aomori, with a maximum intensity of 5-upper (5+) on the Japan Meteorological Agency seismic intensity scale, recorded in Hashikami, Aomori
2026_Sanriku_earthquake
List of software used in plasma physics and magnetohydrodynamics simulations
This is a list of plasma physics software, including programs and tools used for simulating, modeling, and analyzing plasma behavior, magnetohydrodynamics
List of plasma physics software
List_of_plasma_physics_software
Physics related to the study, design, building and operation of particle accelerators
Accelerator physics is a branch of applied physics, concerned with designing, building and operating particle accelerators. As such, it can be described
Accelerator_physics
Non-mathematical introduction
on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience
Introduction to quantum mechanics
Introduction_to_quantum_mechanics
Research facility in Japan
life sciences, and nuclear and particle physics. J-PARC uses high intensity proton beams to create high intensity secondary beams of neutrons, hadrons,
J-PARC
Physical quantity in radiometry
astronomy. "Intensity" has many other meanings in physics, with the most common being power per unit area (so the radiance is the intensity per solid angle
Radiance
Device that emits light via optical amplification
metastable states, which stay excited for a relatively long time. In laser physics, such a material is called an active laser medium. Combined with an energy
Laser
Eruption of electromagnetic radiation
spectral observations. The scheme uses both the intensity and emitting surface. The classification in intensity is qualitative, referring to the flares as:
Solar_flare
Study of physics on quintillionth-second timescales
Attosecond physics, also known as attophysics, or more generally attosecond science, is a branch of physics that deals with light–matter interaction phenomena
Attosecond_physics
Interaction between subatomic particles
In nuclear physics and particle physics, the weak interaction, weak force or weak nuclear force, is one of the four known fundamental interactions, with
Weak_interaction
and Rubens detected wavelengths of sizes around 60 μm. The measured intensity for these special intervals (the Reststrahlen range) indicates a reflectance
Reststrahlen_effect
Technique for determining size distribution of particles
Macromolecular Polydispersity in Intensity Correlation Spectroscopy: The Method of Cumulants". The Journal of Chemical Physics. 57 (11): 4814–4820. Bibcode:1972JChPh
Dynamic_light_scattering
Audible vibration that travels via pressure waves in matter
disturbances propagate through an elastic material medium. In the context of physics, it is characterised as a mechanical wave of pressure or related quantities
Sound
Phenomenon in X-ray tubes
effect or, more precisely, the anode heel effect is a variation of the intensity of X-rays emitted by the anode depending on the direction of emission
Heel_effect
Inelastic scattering of photons by matter
effect occurs. A classical physics based model is able to account for Raman scattering and predicts an increase in the intensity which scales with the fourth-power
Raman_scattering
List compiling of particle accelerators used for particle physics experiments
physics experiments. Some early particle accelerators that more properly did nuclear physics, but existed prior to the separation of particle physics
List of accelerators in particle physics
List_of_accelerators_in_particle_physics
Scales to describe earthquake strength
an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an
Seismic_magnitude_scales
Type of radiation dosimeter
trapped energy in the form of visible light, the intensity of which is proportional to the intensity of the ionizing radiation to which the crystal was
Thermoluminescent_dosimeter
Greek-American space exploration scientist (b. 1938)
then moved to the United States to further his studies. Krimigis studied physics at the University of Minnesota (BSc 1961) and at the University of Iowa
Stamatios_Krimigis
Form of precipitation
condensed from atmospheric water vapor and fall by gravity. Depending on the intensity, rain can be described as a drizzle (very light, sporadic rainfall), a
Rain
Tornado intensity rating scale
Enhanced Fujita scale (abbreviated EF-Scale) is a scale that rates tornado intensity based on the severity of the damage a tornado causes. It is used in the
Enhanced_Fujita_scale
In cosmology, intensity mapping is an observational technique for surveying the large-scale structure of the universe by using the integrated radio emission
Intensity_mapping
The transport-of-intensity equation (TIE) is a computational approach to reconstruct the phase of a complex wave in optical and electron microscopy. It
Transport-of-intensity equation
Transport-of-intensity_equation
Thermal electromagnetic radiation
of radiative intensity that can persist in thermodynamic equilibrium inside a cavity. In equilibrium, for each frequency, the intensity of radiation which
Black-body_radiation
This glossary of physics is a list of definitions of terms and concepts relevant to physics, its sub-disciplines, and related fields, including mechanics
Glossary_of_physics
Penetrating form of electromagnetic radiation
that require 1 cm (0.4 inch) of lead to reduce their intensity by 50% will also have their intensity reduced in half by 4.1 cm of granite rock, 6 cm (2
Gamma_ray
Single-electron double-slit experiment
The Merli–Missiroli–Pozzi experiment was a physics experiment conducted in 1974 that provided the first conclusive evidence of electron interference involving
Merli–Missiroli–Pozzi experiment
Merli–Missiroli–Pozzi_experiment
Study of matter-light interactions at small scales
particular those under the action of high intensity laser fields. The distinction between optical physics and quantum optics is the use of semi-classical
Atomic, molecular, and optical physics
Atomic,_molecular,_and_optical_physics
Semiconductor light source
practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light. Infrared LEDs are used in remote-control circuits
Light-emitting_diode
Historically important optical effect
Gleiter, H; Hahn, H (2017-03-14). "On the relative intensity of Poisson's spot". New Journal of Physics. 19 (3): 033022. Bibcode:2017NJPh...19c3022R. doi:10
Arago_spot
International standard on physical quantities and units of measurement
traffic intensity, A: "number of simultaneously busy resources in a particular pool of resources" traffic offered intensity, A0: "traffic intensity ... of
ISO/IEC_80000
Concept relating to waves and signals
determine molecular structure. In physics, the energy spectrum of a particle is the number of particles or intensity of a particle beam as a function of
Spectrum_(physical_sciences)
Unusual, severe or unseasonal weather
changes to global weather systems can lead to increased frequency or intensity of extreme weather events. Climate change might make some extreme weather
Extreme_weather
Range of frequencies or wavelengths of electromagnetic radiation
spectroscopy can be used to separate waves of different frequencies, so that the intensity of the radiation can be measured as a function of frequency or wavelength
Electromagnetic_spectrum
Subatomic physics phenomenon
I_{0}}} where I is the signal intensity of the nuclear spins when the electron spins are saturated and I0 is the signal intensity of the nuclear spins when
Dynamic_nuclear_polarization
Radiance of a surface
distribution. It refers to material physics as distinct from psychophysics. For the concept of specific intensity, the line of propagation of radiation
Spectral_radiance
Electromagnetic radiation humans can see
is commonly termed visible light. The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization
Light
Chemical compound
common antioxidant assay, and another is a standard of the position and intensity of electron paramagnetic resonance signals. DPPH has several crystalline
DPPH
German-American physicist
extracting information from intensity measurements and from emission line shapes. She wrote 270 pages in the leading physics text of the 1930s and 1940s
Hedwig_Kohn
Flow of electric charge
originates from the French phrase intensité du courant (current intensity). Current intensity is often referred to simply as current. The I symbol was used
Electric_current
Relative unit of measurement
relative unit of measurement to show the ratio of amount of substance, intensity, or other quantities, to a predetermined reference measurement. The reference
Arbitrary_unit
with 1 G = 100 μT. A map of intensity contours is called an isodynamic chart. As the World Magnetic Model shows, the intensity tends to decrease from the
Earth's_magnetic_field
Series of water waves
of tsunami intensity or magnitude to allow comparison between different events. The first scales used routinely to measure the intensity of tsunamis
Tsunami
Uniformity in all orientations
In physics and geometry, isotropy (from Ancient Greek ἴσος (ísos) 'equal' and τρόπος (trópos) 'turn, way') is uniformity in all orientations. Precise
Isotropy
International science award since 2012
in Fundamental Physics is one of the Breakthrough Prizes, awarded by the Breakthrough Prize Board. Initially named Fundamental Physics Prize, it was launched
Breakthrough Prize in Fundamental Physics
Breakthrough_Prize_in_Fundamental_Physics
Physical characteristic of oscillating systems
of several spectroscopic techniques that are used in condensed matter physics Electron spin resonance Mössbauer effect Nuclear magnetic resonance Resonance
Resonance
Study of the physical processes in atmospheric clouds
Cloud physics is the study of the physical processes that lead to the formation, evolution and impacts of atmospheric clouds, including precipitation
Cloud_physics
Branch of physics that studies light
Optics is the branch of physics that studies the behaviour, manipulation, and detection of electromagnetic radiation, including its interactions with
Optics
Range of physical processes in physics
In physics, scattering is a wide range of physical processes where moving particles or radiation of some form, such as light or sound, are forced to deflect
Scattering
American space physicist (1914-2006)
observations that established the radial gradient of galactic cosmic ray intensity from 1 AU to beyond 65 AU in the heliosphere. A member of the National
James_Van_Allen
American experimental cosmologist
Newburgh is an American experimental cosmologist and associate professor of physics at Yale University, where she is a member of the Wright Laboratory and
Laura_Newburgh
Theory of subatomic structure
In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called
String_theory
made an important contribution to the field of physics. Five women have won the Nobel Prize in Physics, awarded annually since 1901 by the Royal Swedish
Women_in_physics
by the Nobel Foundation, based in Sweden. Six categories were awarded: Physics, Chemistry, Physiology or Medicine, Literature, Peace, and Economic Sciences
2018_Nobel_Prizes
Random set of points on a space with random number and random position
\lambda (\cdot )} is called the intensity field of the Cox point process. Stationarity of the intensity measures or intensity fields imply the stationarity
Point_process
In cancer or tumor treatments
therapy". Medical Physics. 22 (11): 1911–1921. Bibcode:1995MedPh..22.1911F. doi:10.1118/1.597446. hdl:2027.42/134769. PMID 8587545. Intensity Modulated Radiation
Radiation_treatment_planning
Technique for detecting quantum objects
crystals, the "ODMR signal" refers to a change in the defect's fluorescence intensity due to a simultaneously applied AC magnetic field. When the magnetic field
Optically detected magnetic resonance
Optically_detected_magnetic_resonance
Relation between peak wavelengths of black body radiation and temperature
the Planck radiation law, which describes the spectral brightness or intensity of black-body radiation as a function of wavelength at any given temperature
Wien's_displacement_law
Spectroscopic techniques that measure the absorption of radiation
of Spectra and Spectroscopy Plot Absorption Intensity for many molecules in HITRAN database Portals: Physics Chemistry Astronomy Stars Outer space Science
Absorption_spectroscopy
Equivalence between complementary antenna types
screen) of the same size and shape except for the overall forward beam intensity. It was formulated in the 1800s by French physicist Jacques Babinet. A
Babinet's_principle
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