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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
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
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
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
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
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
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
Some of the major unsolved problems in physics are theoretical, meaning that existing theories are currently unable to explain certain observed phenomena
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
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
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)
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)
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
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)
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
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
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)
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
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
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
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
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
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
Black hole created from highly concentrated energy
which prevent sufficient energy buildup to create an event horizon. The intensity needed to directly verify this calculation is 50 orders of magnitude than
Kugelblitz_(astrophysics)
German physicist (1862–1947)
1947) was a 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
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
Book by Albert Einstein and Leopold Infeld
The Evolution of Physics: The Growth of Ideas from Early Concepts to Relativity and Quanta is a science book for the lay reader. Written by the physicists
The_Evolution_of_Physics
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
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
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
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
optical circuit Integrating sphere Intense Pulsed Neutron Source Intensity (physics) Intensive and extensive properties Interacting boson model Interaction
Index_of_physics_articles_(I)
American physicist
by his Division of Plasma Physics in 2009, for contributions to the understanding of physics of short pulse high intensity laser matter interactions and
Farhat_N._Beg
Scale for rating tornado intensity
or Fujita–Pearson scale (FPP scale), was a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures
Fujita_scale
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
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)
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
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
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
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
Indian astronomer
Radio Physics and Electronics at Calcutta University. Das Gupta worked with Robert Hanbury Brown and Roger Jennison, in building the first intensity interferometers
Mrinal_Kumar_Das_Gupta
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
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
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
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
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
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
Physics research institute in Russia
theoretical physics, high energy physics (particle physics), heavy ion physics, condensed matter physics, nuclear reactions, neutron physics, and information
Joint Institute for Nuclear Research
Joint_Institute_for_Nuclear_Research
Layout for a sampling calorimeter in high energy physics detectors
In high energy physics detectors, shashlik is a layout for a sampling calorimeter. It refers to a stack of alternating slices of absorber (e.g. lead,
Shashlik_(physics)
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
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
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
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
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
List of software used in plasma physics and magnetohydrodynamics simulations
power studies, and plasma engineering. Physics portal Accelerator physics codes List of computational physics software List of computational fluid dynamics
List of plasma physics software
List_of_plasma_physics_software
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
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
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
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
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)
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
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
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
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
when expressed in the unit mol−1. mol SI Physics Basic candela cd J luminous intensity The luminous intensity, in a given direction, of a source that emits
List_of_international_units
by the Nobel Foundation, based in Sweden. Six categories were awarded: Physics, Chemistry, Physiology or Medicine, Literature, Peace, and Economic Sciences
2018_Nobel_Prizes
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
Region where Earth's magnetic field is weakest relative to an idealised dipole
idealized Earth-centered dipole field. The area of the SAA is confined by the intensity of Earth's magnetic field at less than 32,000 nanotesla at sea level,
South_Atlantic_Anomaly
Energy carried by electromagnetic or gravitational radiation
In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation. As energy, its SI
Radiant_energy
Most basic type of physical force
In physics, the fundamental interactions or fundamental forces are interactions in nature that appear not to be reducible to more basic interactions.
Fundamental_interaction
Optical mechanism
of plasma mirrors as a function of intensity, pulse duration, and angle of incidence". Journal of Applied Physics. 93 (1): 768–770. Bibcode:2003JAP..
Plasma_mirror
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
French-Swedish Nobel laureate physicist (born 1958)
physicist. She is a professor of atomic physics at Lund University in Sweden. She leads an attosecond physics group which works through the movements
Anne_L'Huillier
Type of radiant energy
Spectral intensity of sunlight (average at top of atmosphere) and thermal radiation emitted by Earth's surface.
Shortwave_radiation_(optics)
American physicist
university's Division of Plasma Physics in 2007, for "pioneering contributions to experimental high-intensity laser plasma physics including the production of
Karl_Krushelnick
Rate of transfer of energy through a surface
"Solar Physics Glossary". Nasa. Retrieved 2008-12-24. "Energy flux". Retrieved 2008-12-24. "Sound Energy Terms and Definitions". "Sound Intensity Terms
Energy_flux
Full range of electromagnetic radiation frequencies
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
Practice of steering a beam of radiation or charged particles across an object
Varian's IMPT system uses all pencil-beam controlled protons where the beam intensity can also be controlled at this small level. This can be done by going
Pencil-beam_scanning
and Rubens detected wavelengths of sizes around 60 μm. The measured intensity for these special intervals (the Reststrahlen range) indicates a reflectance
Reststrahlen_effect
maximum values. Since the intensity (given by the Poynting vector) is proportional to the square of the field amplitude, the intensity drops by 1 / e 2 = 0
Mode_field_diameter
Chilean researcher
(2006). Physics: trajectory in Chile. Historia (Santiago), 2(se) Retrieved July 8, 2020. Arias, Arturo (1970), A measure of earthquake intensity, Proa,
Arturo_Arias_(engineer)
Canadian physicist, engineer, and Nobel laureate
professor in physics at the University of Waterloo. Strickland is currently a professor, leading an ultrafast laser group that develops high-intensity laser
Donna_Strickland
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
This article summarizes equations in the theory of nuclear physics and particle physics. The following apply for the nuclear reaction: a + b ↔ R → c in
List of equations in nuclear and particle physics
List_of_equations_in_nuclear_and_particle_physics
Subatomic particle with positive charge
or various particle physics experiments, with the most powerful example being the Large Hadron Collider. Unsolved problem in physics How do the quarks and
Proton
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
French physicist (1841–1923)
luminous intensity, called the Violle, equal to the light emitted by 1 cm² of platinum at its melting point. It was the first unit of light intensity that
Jules_Violle
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
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
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
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
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
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
Phenomenon in solid-state physics of semiconductors
In solid-state physics of semiconductors, carrier generation and carrier recombination are processes by which mobile charge carriers (electrons and electron
Carrier generation and recombination
Carrier_generation_and_recombination
Italian/American physicist
colliders. He studied the physics of particle beams in accelerators, specifically instabilities and collective effects in high intensity particle beams resulting
Claudio_Pellegrini
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