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Topic: Compton wavelength

	Photoelectrons, Compton and Inverse Compton Scattering
		To show this, Compton scattered x-ray radiation off a graphite block and measured the wavelength of the x-rays before and after they were scattered as a function of the scattering angle.
		Compton was able to account for and derive the correct expression for the shift in wavelength.
		Compton argued that the shift in wavelength is a result of a single photon imparting momentum to a single electron; thus the theory is derived from the laws of conservation of energy and momentum.
	venables.asu.edu /quant/proj/compton.html (779 words)

	Hubble's Constant in Terms of the Compton Effect
		The increase in wavelength is inversely proportional to the mass of the particle.
		The Compton effect explains the red shift on the sun being greater at the limb than at the center because the number of electrons along the line of sight through the solar atmosphere is greater at the limb.
		The Compton effect does not depend on the electric charge of the electron, but rather is a consequence of conservation of momentum and energy.
	www.angelfire.com /az/BIGBANGisWRONG/Hubble_latest_web.htm (1282 words)

	Magnetic field
		Derive the expression for the shift in wavelength and plot the shift as a function of the scattering angle theta.
		For (b) and (c), assume that the wavelength of the incident photon is 10 pm, 5 pm, and 2 pm.
		The wavelength of the incident photon: 10 pm, 5 pm, and 2 pm.
	web.alfredstate.edu /takeuchi/maple12.htm (228 words)

	Arthur H. Compton - Biography
		Arthur Holly Compton was born at Wooster, Ohio, on September 10th, 1892, the son of Elias Compton, Professor of Philosophy and Dean of the College of Wooster.
		Compton returned to St. Louis as Chancellor in 1945 and from 1954 until his retirement in 1961 he was Distinguished Service Professor of Natural Philosophy at the Washington University.
		During 1930-1940, Compton led a world-wide study of the geographic variations of the intensity of cosmic rays, thereby fully confirming the observations made in 1927 by J. Clay from Amsterdam of the influence of latitude on cosmic ray intensity.
	nobelprize.org /nobel_prizes/physics/laureates/1927/compton-bio.html (841 words)

	Compton Scattering
		The scattering of photons from charged particles is called Compton scattering after Arthur Compton who was the first to measure photon-electron scattering in 1922.
		The wavelength change in such scattering depends only upon the angle of scattering for a given target particle.
		This exploration is designed to accept values for the input wavelength or energy and the angle of scattering.
	hyperphysics.phy-astr.gsu.edu /hbase/quantum/compton.html (173 words)

	Compton.html
		The wavelength shift Delta is given by subtracting the original wavelength lambda0 from lambda; the latter is obtained by isolating lambda in eq3.
		The wavelength shift Delta does not depend on the original wavelength lambda0 and is given as a multiple of a natural length scale for the electron, namely the Compton wavelength of the electron h/(M*c).
		To put this in relation with the photon wavelengths we note that hard X rays have wavelengths that are thousands of times shorter than those of visible light (0.1 nm vs 450-700 nm, 1 Angstrom = 0.1 nm).
	www.yorku.ca /marko/PHYS2010/ComPhys/Compton/Compton.html (1592 words)

	Compton wavelength - Wikipedia, the free encyclopedia
		The Compton wavelength can be thought of as a fundamental limitation on measuring the position of a particle, taking quantum mechanics and special relativity into account.
		The Compton wavelength can be contrasted with the de Broglie wavelength, which depends on the momentum of a particle and determines the cutoff between particle and wave behavior in quantum mechanics.
		This is a simple case of dimensional analysis: the Schwarzschild radius is proportional to the mass, whereas the Compton wavelength is proportional to the inverse of the mass.
	en.wikipedia.org /wiki/Compton_wavelength (527 words)

	Foundation of Quantum Theory
		A graphite target was bombarded with monochromatic x-rays and the wavelength of the scattered radiation was measured with a rotating crystal spectrometer.
		The appearance of the peak at the longer wavelength in the intensity vs. wavelength curve is due to Compton scattering from the electron which may be considered free, since its energy of binding in the atom is small compared to the energy hf of the photon.
		The appearance of the other peak at the wavelength of the incident radiation is due to scattering from a bound electron.
	physics.berea.edu /~king/Teaching/ModPhys/QM/QM1.htm (2080 words)

	Compton scattering - Wikipedia, the free encyclopedia
		Compton scattering is of prime importance to radiobiology, as it happens to be the most probable interaction of high energy X rays with atomic nuclei in living beings and is applied in radiation therapy.
		Compton scattering has on occasion been proposed as an alternative explanation for the phenomenon of the redshift by opponents of the Big Bang theory, although this is not generally accepted because the influence of the Compton scattering would be noticeable in the spectral lines of distant objects and this is not observed.
		Compton Scatter is an important effect in Gamma spectroscopy, as it is possible for the gamma rays to scatter out of the detectors used.
	en.wikipedia.org /wiki/Compton_effect (749 words)

	Compton Effect and the e-Bomb
		Compton scattering is what we call the deflections and the change of wavelength.
		The Compton effect usually occurs with high energy gamma-rays and low atomic numbers because their electrons are more loosely bound to the nucleus.
		When an e-bomb goes off (here's where Compton's effect comes in) the gamma radiation photons from the bomb deflect a lot of electrons from the atmosphere's nitrogen and oxygen atoms.
	www.physics247.com /particlesandradiation/0002.shtml (385 words)

	The Nature of Light
		Photons are discrete and the collisions of the Compton effect suggest a spherical symmetry with respect to them.
		Note also that the momentum of the photon must reduce to the classical dimensions for a coupling with the (Compton) wavelength of the experimentally derived intrinsic magnetic moment of the electron.
		The Compton effect is a coupling of the wavelength of the intrinsic magnetic moment with the photon.
	wbabin.net /babin/wd2.htm (976 words)

	Electron
		Compton scattering is related by crossing symmetry to pair annihilation:
		It can be seen that the electron on the left side of the Compton process can be replaced by its antiparticle, the positron, on the other side of the interaction resulting pair annihilation.
		The Compton effect, discovered by Compton in 1923, provided the final confirmation of the validity of Planck’s quantum hypothesis that electromagnetic radiation came in discrete mass less packets (photons) with energy proportional to frequency.
	teachers.web.cern.ch /teachers/archiv/HST2002/Bubblech/mbitu/electron-positron.htm (473 words)

	Lengths
		The Compton wavelength of a particle, roughly speaking, is the length scale at which relativistic quantum field theory becomes crucial for its accurate description.
		The Compton wavelength of the electron is the characteristic length scale of QED (quantum electrodynamics).
		Well, remember that the Compton wavelength of a particle is the length scale at which quantum field theory becomes very important in describing it.
	math.ucr.edu /home/baez/lengths.html (2897 words)

	Giancoli, Physics : Principles with Applications, 5/E Chapter 27 -- Practice Questions
		A 450 nm wavelength photon strikes the metal surface in question 10, what is the maximum energy of the emitted electrons?
		A 8300 eV photon compton scatters at 0 degrees.
		What is the wavelength of a photon with the same momentum as the the proton in the previous question?
	cwx.prenhall.com /bookbind/pubbooks/giancoli/chapter27/multiple1/deluxe-content.html (413 words)

	[No title]
		Some of the energy and momentum is transferred to the electron (this is known as the Compton effect), but both energy and momentum are conserved in this elastic collision.
		is the mass of the electron, is known as the Compton wavelength.
		The collision causes the photon wavelength to increase by somewhere between 0 (for a scattering angle of 0°) and twice the Compton wavelength (for a scattering angle of 180°).
	physics.bu.edu /~duffy/semester2/c35_compton.html (297 words)

	The Compton Effect, Newtonian Velocities, The Fundamental Particle
		However, the appearance of the magnetic field at the electron identifies a partially elastic or totally inelastic field coupling at the Compton wavelength, and the subsequent emission of radiation.
		With a wavelength equal to the ground state of a hydrogen atom, the mass equivalence of the photon, or in this case the equivalent Coulomb field, would be m
		As the electron approaches the nucleus, the Compton effect shows that the induced electric field approaches the magnitude of the primary field.
	wbabin.net /babin/wd5.htm (739 words)

	Compton Effect (Site not responding. Last check: 2007-11-03)
		Einstein's photoelectric discussion of 1905 and his other work including "Special Relativity" led physicists to speculate on the "momentum" of these "packets" of light which became known as "photons".
		Arthur Compton and Debye both provided in 1922 a very simple mathematical framework for the momentum of these photons with Compton having experimental evidence from firing X-Rays of known frequency into graphite and looking at recoil electrons.
		They enter the graphite at one wavelength and leave at a longer wavelength as they have transfered both momentum and kinetic energy to an electron.
	www.launc.tased.edu.au /online/sciences/physics/compton.html (293 words)

	Lecture 7 : Compton Scattering
		In strong Comptonisation, the photon energy is increased until the electron and photon energy distributions approach equilibrium, i.e.
		Figure 7.4 illustrates strong comptonisation of a bremsstrahlung spectrum in an optically thick, non-relativistic medium.
		In the previous section we derived forms for the spectrum when the amount of Comptonisation in a non-relativistic medium is weak and strong.
	www.astro.utu.fi /~cflynn/astroII/l7.html (1386 words)

	Kierein's Erroneous Compton Model for the Redshift
		Kierein proposes that the Compton shift causes the redshift.
		The wavelength shift per scattering is the Compton wavelength times (1-cos(theta)), which is only a small fraction of an Angstrom.
		If the total wavelength change of 185 nm is produced in steps of the Compton wavelength = 0.0024 nm, then 77,000 scatterings are needed and one would expect a standard deviation of sqrt(77,000) = 278 leading to a FWHM of sqrt(8ln2)278*0.0024 = 1.6 nm.
	www.astro.ucla.edu /~wright/kierein.html (1268 words)

	Maximun energy of a photon
		I mean the compton wavelength of a flea is about the same as the Planck length.
		Are you saying that a photon with a wavelength of the pPlanck length would be unable to escape it's own gravitaional field, cos I believe that's been theorized, but I'm unsure.
		This logic is obviously fallacious as from a different reference frame the photon's wavelength would be blue-shifted above the Planck wavelength so following this logic it wouldn't collapse in this reference frame, so we must reject it collapsing in a refernce frame where it's wavelength is below the Planck length.
	www.physicsforums.com /showthread.php?p=55799 (945 words)

	Is the electron a small black hole ... (Site not responding. Last check: 2007-11-03)
		If any photon is gravitationally blueshifted to the wavelength (3/2) exponent 1/2 times 2 pi (Planck length) it would have the energy density required to collapse and produce a pair of fl holes, each with a photon capture radius (3G m/c squared) equal to the photon wavelength divided by 2 pi.
		The photon wavelength with energy equal to the mass energy of two electron particles is (0.5) times the electron Compton wavelength.
		If the true value of (0.5) times the electron Compton wavelength is (2 pi) times (3pi hG/c) exponent 1/4, the mass or energy to photon wavelength relationship is defined by the gravitational constant and the electron mass.
	www.geodatabase.de /electron (539 words)

	A Planck Linking Compton and Schwarzchild
		But wait, there are two ways of relating mass to distance, one is through the Compton wavelength associated with a mass, the other is by the Schwarzchild radius for that mass.
		The action associated with the Compton wavelength is with respect to a rotation of the phase vector of 2.Pi radians.
		Though there is the implied intention of using the Compton wavelength associated with the mass unit, to do so would be inconsistent with having G = 1.
	members.aol.com /InPlaceOfSI/Planck.htm (677 words)

	Compton (Site not responding. Last check: 2007-11-03)
		Nobel Prize, 1927; for his discovery of the effect named for him, the Compton Effect, having to do with the scattering of x-rays by electrons and the change in wavelength that results.
		Born in Wooster, Ohio and educated at Princeton and Cambridge, England, Arthur Compton concerned himself with a theory of the interaction of x-rays with matter.
		He suggested that light could be considered as a particle, having momentum and energy and that the scattering of light and x-rays occurred with conservation of energy and momentum, as in the collision of elastic billiard balls.
	indykfi.atomki.hu /indyKFI/MT/compton.htm (152 words)

	Quantum Physics
		Compton effect (1923) - X-rays that irradiate a substance lose energy when they strike the substance (the wavelengths of the X-rays that are scattered by striking the substance are longer, or lower in energy).
		We can measure the wavelength of a particle but we do not know what is "waving." We do not know what quantity in a matter wave corresponds to the electric field in an electromagnetic wave.
		If the wavelength of the wave was such that the wave did not close in upon itself, destructive intereference would occur.
	www.pschweigerphysics.com /quantum.html (3766 words)

	physics - Compton wavelength (Site not responding. Last check: 2007-11-03)
		The Compton wavelength λ of a particle X is given by λ
		The Compton wavelength is therefore generally viewed as the cutoff below which quantum field theory, which can describe particle creation and annihilation, becomes important.
		The Compton length for one Planck mass is equal to the Planck length and is also equal to the Schwarzschild radius of one Planck mass.
	www.physicsdaily.com /physics/Compton_wavelength (173 words)

	New Metric Fables, Compton wavelength, flea (Site not responding. Last check: 2007-11-03)
		Her density was pretty ordinary and in metric terms, since her volume was some 22 millionths of a cubic centimeter her mass was some 22 millionths of a gram.
		Holly had one point of vanity which was that her Compton wavelength was exactly equal to the Planck length.
		This means that if she could have somehow turned herself into a flash of light—all her mass energy going into a single quantum—that photon would have had wavelength (and I mean wavelength, the radian version, not cyclelength!) equal to the Planck unit.
	www.rhymenet.com /antimetricfables/flea.htm (659 words)

	Notes 1
		The combination out front, h/mc is called the "Compton wavelength of the electron", and has numerical value 2.4*10^-10 cm.
		This result is a radical departure from classical E+M. Compton observed this shifted wavelength in the lab.
		The quantitative connection between momentum (or energy, via Einstein's equations) and wavelength were quantitatively verified in these experiments, and many more since then involving neutron scattering, alpha particles, He atoms, and much more....
	www.colorado.edu /physics/phys3220/3220_fa97/notes/notes1/3220_notes1_3.html (1298 words)

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