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Electromagnetic Radiation
 
(EMR) Electromagnetic radiation consists of an electric and a magnetic field component. All EMR travels in a vacuum at the speed of light. EMR is classified related to the frequency//length of the wave.
An EM wave consists of discrete packets of energy, named photons (quantization). The energy of the photons depends on the frequency of the wave. Planck-Einstein equation:
E = h * f
E (energy); h (Planck's constant); f (frequency)
EMR types include in order of increasing frequency//decreasing wavelength: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, x-rays and gamma rays. EMR contains energy and momentum, which may be imparted when it interacts with matter.
See Gamma Radiation.
 
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Electromagnetic radiationOpen this link in a new window
'Electromagnetic radiation (sometimes abbreviated EMR) takes the form of self-propagating waves in a vacuum or in matter. EM ...'
by en.wikipedia.org    
Measuring the electromagnetic spectrumOpen this link in a new window
'You actually know more about it than you may think! The electromagnetic (EM) spectrum is just a name that scientists give a bunch ...'
by imagine.gsfc.nasa.gov    
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Annihilation
 
Annihilation in general refers to the transition of a particle and its antiparticle by collision into something different, depending on their energies and based on the conservation of energy and momentum. The electromagnetic radiation emitted is the result of the annihilation (combination and disappearance) of an electron and a positron. Two gamma rays of 0.511 MeV energy, assuming very low-energy particles, are emitted perpendicular to each other.


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AnnihilationOpen this link in a new window
'Annihilation is defined as "total destruction" or "complete obliteration" of an object;[1] having its root in the Latin nihil ...'
by en.wikipedia.org    
Electron-positron annihilationOpen this link in a new window
'Electron-positron annihilation occurs when an electron and a positron (the electron's anti-particle) collide. The result of the ...'
by en.wikipedia.org    
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Gamma Quantum
 
A gamma quantum is a distinct photon of electromagnetic radiation with the highest energy, shortest wavelength. The energy of a single photon is above 100 keV, the wavelength is below about 10 picometers. Gamma photons are generated by processes within the atomic nuclei.

See also Quantum.


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Gamma rayOpen this link in a new window
'Gamma rays (denoted as ) are a form of electromagnetic radiation or light emission of frequencies produced by sub-atomic ...'
by en.wikipedia.org    
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Gamma Radiation
 
Gamma radiation is electromagnetic radiation emitted in decay of radionuclides. Also called gamma ray and sometimes shortened to gamma (e.g., gamma-emitting radionuclides).
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Photoelectric Effect
 
The photoelectric effect describes the following interaction of electromagnetic radiation with a metallic surface: a photon with an energy (frequency) above the binding energy of an electron gets absorbed and the electron is emitted. The positive energy difference is transferred to the electrons kinetic energy. If the photons energy is not high enough for the electron to overcome its binding forces, the photon will be re-emitted. It is not the intensity of a photon beam (amount of photons) which allows the photoelectric effect; it is the energy (frequency) of a single photon which will allow the emission of a single photoelectron.
The discovery and study of the photoelectric effect leads to a new quantized understanding in physics. Albert Einstein was awarded the Noble prize for physics in 1921 'for his services to theoretical physics and especially for his discovery of the law of the photoelectric effect'.
The photoelectric effect is the most important effect in medical radiography. E.g. it is photoelectric absorption that is responsible for most of the absorption in a mammogram which creates the contrast in the image.

See also Photon, Electron.


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The PHOTO-ELECTRIC EFFECTOpen this link in a new window
'IMPORTANCE Physicists run into the problem of light interacting with charge. To explain the experimental data, a new physics is ...'
by www.launc.tased.edu.au    
Photoelectric effectOpen this link in a new window
'The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of ...'
by en.wikipedia.org    
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Use of the Photoelectric Absorption MeasurementsOpen this link in a new window
'There is, in principle, a simpler approach to the calculation of the dispersion terms by using the following relationship between ...'
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