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# Topic: Intensity (physics)

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###### In the News (Thu 20 Jun 19)

 Dr. William Bickel's Laboratory Courses Offered The transmission and reflective intensity distributions will be derived and related to the convolutions needed to measure the widths, shifts and shapes of spectral lines. This course is intended to serve students in physics and other disciplines who will not normally take the Physics Advanced Laboratory (Physics 480/481a,b), Optics (Physics 320), or Atomic Spectroscopy for Experimentalists (Physics 474/574). Theory deals with the interferometer and associated optics/electronics that make it useful as a Fourier spectrometer. www.physics.arizona.edu /~bickel/course6.html

 Wave Interference This live phasor addition can be compared to both intensity plots (gray scale and line) and to the numerical value of the relative intensity. Physics Academic Software publishes education software for the physics teaching community in cooperation with the American Institute of Physics, the American Physical Society, and the American Association of Physics Teacher. Display how phasors are used to obtain various intensity patterns. webassign.net /pasnew/wave_interference/wavein.html

 field intensity In physics, the field strength of a field is its force per unit at a point. The field strength of the earth increases linearly from its centre to its radius, and from the surface decreases proportionate to the inverse square of the distance from its centre. Where the field originates from a sphere it can be assumed that the force acts from a point at its centre. www.yourencyclopedia.net /Field_intensity

 Intensity - Wikipedia, the free encyclopedia In physics, the word "intensity" is not synonymous with "strength", "amplitude", or "level", as it sometimes is in colloquial speech. In physics, intensity is a measure of the time-averaged energy flux. To find the intensity, take the energy density (that is, the energy per unit volume) and multiply it by the velocity at which the energy is moving. en.wikipedia.org /wiki/Intensity   (342 words)

 Physics Help and Math Help - Physics Forums - Candela Intensity is very often confused with irradiance, which is the flux per unit area. and luminous intensity is that, with a correction factor for it to be useful for human perception. 09-02-2004 10:31 AM The radiant intensity is the radiant flux emitted per unit of solid angle by a point source in a given direction. www.physicsforums.com /printthread.php?t=41410   (1129 words)

 Scintillation Crystals: Properties and Use Scintillation light pulses (flashes) are usually characterized by a fast increase of the intensity in time (pulse rise time) followed by an exponential decrease. The decay time of a scintillator is defined by the time after which the intensity of the light pulse has returned to 1/e of its maximum value. The scintillator emission wavelength should be matched to the sensitivity of the light detection device that is used (PMT of photodiode). www.scionixusa.com /crystals.html   (1129 words)

 Phasor Addition Add the square roots of the intensities according to the phasor diagram to find the square root of the intensity with all sources active. , and because amplitudes add according to phasor diagrams, label each phasor with the square root of the intensity of its source when that source alone is active. Thus, the phasors are parallel, as shown in the diagram. wug.physics.uiuc.edu /courses/phys114/fall01/Discussions/html/wk2/sol2_2.htm   (1129 words)

 Physics News 154, December 3, 1993 Scientists at the Institute of Earth Physics in Paris found that during a period of stable polarity the intensity fell slowly but that after a polarity change the intensity regenerated rapidly. PHYSICS NEWS UPDATE A digest of physics news items prepared by Phillip F. Schewe, AIP Public Information Number 154 December 3, 1993 The Washington researchers (contact Steve Lamoreaux, 206-543-2540) detected parity violation in atoms by measuring a slight change (10**- 7 radians, with an accuracy of 1%) in the polarization angle of light passing through a vapor of lead atoms. newton.ex.ac.uk /aip/physnews.154.html   (622 words)

 Nuclear Physics Brochure Other areas of research in Nuclear Physics use high-energy high-intensity electron beams to unravel the internal substructure of the nucleus and of its constituents, the nucleons, in terms of quarks, as well as high-energy high-intensity proton beams to study the properties of the other "hadrons"than the nucleons, i.e. Nuclear Physics, the science of the atomic nucleus, is a very active field of research within European Science. One is the understanding of the behaviour of nuclei when they are rotating at incredibly large angular velocities, the so-called high-spin state nuclear physics, and of the exotic shapes that the nucleus may have when rotating with to such velocities, as illustrated in Figure 4. www.cyc.ucl.ac.be /npbrochure   (5260 words)

 AllRefer.com - candle, unit of luminous intensity (Physics) - Encyclopedia AllRefer.com - candle, unit of luminous intensity (Physics)- Encyclopedia You are here : AllRefer.com > Reference > Encyclopedia > Physics > candle, unit of luminous intensity candle, in weights and measures, unit of luminous intensity; it is defined as 1/60 of the intensity of a black body, or ideal radiator, at the temperature at which platinum solidifies (2,046°K). reference.allrefer.com /encyclopedia/C/candle-wNm.html   (169 words)

 namba.txt In a study of the typical exploding granule, the size and intensity depression of the central darkening are shown to evolve with granule expansion in the rapidly growing phase, and the intensity drop is found to reach 25 percent of the granule brightness. Granules with the shortest axis of 2.2 arcsec are seen to develop the characteristic ring-like appearance with a round darkening in the center, and the exploding granules are found to occupy roughly 2.5 percent of the solar surface at any moment. The exploding-granule phenomenon is interpreted qualitatively in terms of cooling at the photospheric level and the subsequent sinking of cold matter at the center of a granule due to loss of buoyancy Title: Report of the Dutch expedition to the 1970 March 7 solar eclipse. www.phys.uu.nl /~rutten/rrtex/bibfiles/ads/abs/namba.txt   (967 words)

 Expert: Glow Discharge Plasmas, Lasers Expert He is one of the leading experts on the physics of glow discharges, especially on the sheaths (or boundary regions) of these discharges. Expert was a member of the National Research Council - N.I.S.T. Panel for Atomic, Molecular, and Optical Physics and the National Research Council Panel on Plasma Processing of Materials. These glow discharges are used as sources of coherent (laser) and incoherent light, for the plasma processing of materials and for other applications. www.intota.com /viewbio.asp?bioID=605136&perID=716360   (357 words)

 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations A future plan on high-intensity muon sources which is needed to explore muon physics further is also presented as well as a high-intensity neutrino source based on muon decay. A list of various physics topics to study the fundamental symmetries in the processes involving the muon is presented. Kuno, Yoshitaka [Department of Physics, Osaka University, Toyonaka, Osaka 506 (Japan)] www.osti.gov /energycitations/product.biblio.jsp?osti_id=20482173   (357 words)

 Intensity "Intensity" in physics has not to be mixed up with the colloquial speech of the words "strength", "amplitude" or "level". where P is the net power radiated, I is the intensity as a function of position, and dA is a differential element of a closed surface that contains the source. Where I is the intensity at the surface of the sphere, and r is the radius of the sphere (note: enclosed in parentheses is the expression for the surface area of a sphere). www.bidprobe.com /en/wikipedia/i/in/intensity.html   (357 words)

 Physics 20: Characteristics of Sound - Intensity The intensity of sound is a measure of the average rate of sound energy flow per unit area across a surface perpendicular to the direction of propagation. Also, the ear is responsive to sound intensities over a range of about 14 orders of magnitude (but roughly a 25% increase in intensity is required to perceive a change). Explain that the intensity of a sound, as well as its duration, determine the extent of hearing damage that could occur from it. www.sasked.gov.sk.ca /docs/physics/u5c12phy.html   (357 words)

 AllRefer.com - candle, unit of luminous intensity (Physics) - Encyclopedia You are here : AllRefer.com > Reference > Encyclopedia > Physics > candle, unit of luminous intensity candle, in weights and measures, unit of luminous intensity; it is defined as 1/60 of the intensity of a black body, or ideal radiator, at the temperature at which platinum solidifies (2,046°K). More articles from AllRefer Reference on candle, unit of luminous intensity reference.allrefer.com /encyclopedia/C/candle-wNm.html   (357 words)

 Physics 128 Lecture: Sound The intensity of a periodic sound wave is proportional to the square of the amplitude and the square of the frequency of the wave. The intensity I of a wave, or the power per unit area, is the rate at which energy is transported by the wave through a unit area A perpendicular to the direction of travel of the wave. Intensity is usually express in terms of a quantity called the sound level. www.cord.edu /dept/physics/p128/lecture98_34.html   (917 words)

 The Physics Classroom This intensity corresponds to a pressure wave in which a compression of the particles of the medium increases the air pressure in that compressional region by a mere 0.3 billionths of an atmosphere. As a sound wave carries its energy through a two-dimensional or three-dimensional medium, the intensity of the sound wave decreases with increasing distance from the source. Applied to the diagram at the right, the intensity at point B is one-fourth the intensity as point A and the intensity at point C is one-sixteenth the intensity at point A. Since the intensity-distance relationship is an inverse relationship, an increase in one quantity corresponds to a decrease in the other quantity. www.physicsclassroom.com /Class/sound/U11L2b.html   (1282 words)

 Physics Sound intensity, which is measured in W/m^2 is different from sound intensity level, measured in dB. Sound intensity is related to the ability to hear different frequencies since our ears are able to hear middle frequencies better, 2000-4000Hz. The sound intensity is derived into phons which are a unit for loudness, the intensity level in dB at 1000Hz. www.hivepc.com /physics/sound.html   (877 words)

 Physics Tutoring: Electromagnetic Waves luminous intensity: The luminous flux incident on a small surface which lies in a specified direction from a light source and is normal to this direction, divided by the solid angle (in steradian) which the surface subtends at the source of light. luminous coefficient: A measure of the fraction of the radian power of a light source which contributes to its luminous properties, equal to the average of the luminosity function at various wavelengths, weighted according to the spectral intensity of the source. luminosity factor: The ratio of the luminous flux in lumens emitted by a source at a particular wavelength to the corresponding radian flux, in watts, at the same wavelength this is a measure of the visual sensitivity of the eye. www.slcc.edu /schools/hum_sci/physics/tutor/2220/em_waves   (1034 words)

 Stress The intensity of the internal forces in a body which tend to resist the relative displacement of the constituent particles. (physics) force that produces strain on a physical body. To be exact, the stress at a point may be determined by taking the limit of the load being carried by a particular cross section, divided by that cross section, as the area of the cross section aproaches zero. www.websters-online-dictionary.com /definition/english/st/stress.html   (4318 words)

 Solar Cell In 1989 a concentrator solar cell, a type of device in which sunlight is concentrated onto the cell surface by means of lenses, achieved an efficiency of 37 percent due to the increased intensity of the collected energy. Solar cells (as the name implies) are designed to convert (at least a portion of) available light into electrical energy. Solar cells are characterized by a maximum Open Circuit Voltage (Voc) at zero output current and a Short Circuit Current (Isc) at zero output voltage. encyclobeamia.solarbotics.net /articles/solar_cell.html   (733 words)

 Physics 20: Characteristics of Sound - Intensity The intensity of sound is a measure of the average rate of sound energy flow per unit area across a surface perpendicular to the direction of propagation. Explain that the intensity of a sound, as well as its duration, determine the extent of hearing damage that could occur from it. Also, the ear is responsive to sound intensities over a range of about 14 orders of magnitude (but roughly a 25% increase in intensity is required to perceive a change). www.sasked.gov.sk.ca /docs/physics/u5c12phy.html   (1290 words)

 Physics Demonstrations - Sound A dramatic illustration of the variation of the speed of sound with the density of a gas is performed by breathing a low density and a high density gas and talking as the gas is expelled from the lungs. The speed of sound in a gas is proportional to the square root of its density. Sound appears to be a topic distinct from motion and heat. sprott.physics.wisc.edu /demobook/chapter3.htm   (7341 words)

 Gamma FAQ - Frequently Asked Questions about Gamma In physics, radiant intensity and radiance are integrated across a wide range of wavelengths. Radiant intensity refers to radiant power (flux) in a particular, specified direction. Radiant intensity potentially has a large spatial extent, but imaging systems use pixels with small area: It is inappropriate to use intensity as a metric for image data. www.poynton.com /notes/colour_and_gamma/GammaFAQ.html   (4144 words)

 Luminosity - Wikipedia, the free encyclopedia In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given direction. In astronomy, luminosity is the amount of energy a body radiates per unit time. en.wikipedia.org /wiki/Luminosity   (731 words)

 Dainis Dravins (Lund Observatory) Classical physics merges all radiation of a certain wavelength into the quantity "intensity". intensity multiplied by itself, which in the quantum limit means observations of pairs of photons or of statistical two-photon properties. intensity multiplied n times by itself, which in the quantum limit means observations of groups of n photons or of statistical n -photon properties. www.astro.lu.se /~dainis/HTML/QUANTOPT.html   (731 words)

 Encyclopedia of Laser Physics and Technology - injection locking, integrated optics, intensity noise, intermodal dispersion The intensity noise in a laser beam may be reduced with a noise eater. For example, if two light beams of equal intensity, frequency and polarization are superimposed on a screen with some angle, one obtains an interference pattern consisting of bright and dark stripes, and the spatially averaged intensity equals the sum of the intensities of the single beams. A white light interferometer uses a broadband light source (i.e., with low temporal coherence), so that interference fringes are observed only in a narrow range around the point of zero arm length difference. www.rp-photonics.com /encyclopedia_i.html   (731 words)

 Physics News Update 699 The necessity of such many-body forces was empirically known from traditional nuclear physics and the merit of the QMC model is that it explains their origin and predicts their intensity. , experimental studies are less able to resolve details inside the nucleon), one is apt to see nuclear physics as being a bunch of nucleons interacting via the exchange of mesons. This makes for a more realistic description, particularly for the border area between higher energy (a province sometimes called particle physics) and lower energy (to which the generic term "nuclear physics" applies). www.aip.org /pnu/2004/split/699-1.html   (731 words)

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