Electromagnetic radiation
hideElectromagnetic radiation (sometimes abbreviated EMR) is a ubiquitous phenomenon that takes the form of self-propagating waves in a vacuum or in matter. It consists of electric and magnetic field components which oscillate in phase perpendicular to each other and perpendicular to the direction of energy propagation. Electromagnetic radiation is classified into several types according to the frequency of its wave; these types include (in order of increasing frequency and decreasing wavelength): radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. A small and somewhat variable window of frequencies is sensed by the eyes of various organisms; this is what we call the visible spectrum, or light.
EM radiation carries energy and momentum that may be imparted to matter with which it interacts.
For more information about Electromagnetic radiation, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with electromagnetic waves
Cellphone powers back pain chip in Taiwan
18 hours ago |
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Taiwanese researchers have developed a chip to treat backpain that is powered by mobile phone, a member of the team said Friday.
New nano color sorters from Molecular Foundry
Nov 12, 2009 |
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Berkeley Lab researchers have engineered a new class of bowtie-shaped devices that capture, filter and steer light at the nanoscale. These "nano-colorsorter" devices act as antennae to focus and sort light ...
Sculptured materials allow multiple channel plasmonic sensors
Nov 10, 2009 |
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(PhysOrg.com) -- Sensors, communications devices and imaging equipment that use a prism and a special form of light -- a surface plasmon-polariton -- may incorporate multiple channels or redundant applications if manufacturers ...
Smallest nanoantennas for high-speed data networks
Oct 20, 2009 |
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More than 120 years after the discovery of the electromagnetic character of radio waves by Heinrich Hertz, wireless data transmission dominates information technology. Higher and higher radio frequencies are ...
Company Introduces Novel Nanotechnology for Revolutionizing Imaging Using T-rays
Oct 20, 2009 |
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Yissum Research Development Company of the Hebrew University of Jerusalem today announced that Professor L.D. Shvartsman and Professor B. Laikhtman, from the Racah Institute of Physics at the Hebrew University of Jerusalem, ...
Ganymede makes big impression on Jupiter's auroral lightshows (w/ Video)
Sep 18, 2009 |
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(PhysOrg.com) -- Studies of features in Jupiter’s spectacular and rapidly changing aurorae have given new insights into the complex electromagnetic interactions between the giant planet and two of its innermost ...
Mobile phone towers a threat to honey bees: study
Aug 31, 2009 |
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The electromagnetic waves emitted by mobile phone towers and cellphones can pose a threat to honey bees, a study published in India has concluded.
Mathematical keys to a sixth sense -- the lateral-line system
Aug 28, 2009 |
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Biophysicists at the Technische Universitaet Muenchen are leading an effort to develop and apply models of the so-called lateral-line system found in fish and some amphibians. This sensory organ enables an animal, even in ...
A New Cloaking Method: This is not a 'Star Trek' or 'Harry Potter' Story (w/ Video)
Aug 17, 2009 |
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(PhysOrg.com) -- University of Utah mathematicians developed a new cloaking method, and it's unlikely to lead to invisibility cloaks like those used by Harry Potter or Romulan spaceships in "Star Trek." Instead, ...
Beyond the looking glass...
Aug 13, 2009 |
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While the researchers can't promise delivery to a parallel universe or a school for wizards, books like Pullman's Dark Materials and JK Rowling's Harry Potter are steps closer to reality now that researchers ...
Researcher Investigates the Basis of Einstein's First Approximation in the Theory of Relativity
Jul 15, 2009 |
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(PhysOrg.com) -- In his discussion of accelerated motion on page 60 of The Meaning of Relativity, Albert Einstein made an approximation that allowed him to develop the theory of relativity further. Einstein apparently never ...
Scientists closer to making invisibility cloak a reality
Mar 05, 2009 |
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J.K. Rowling may not have realized just how close Harry Potter's invisibility cloak was to becoming a reality when she introduced it in the first book of her best-selling fictional series in 1998. Scientists, however, have ...
Plasmonic whispering gallery microcavity paves the way to future nanolasers
Jan 24, 2009 |
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The principle behind whispering galleries - where words spoken softly beneath a domed ceiling or in a vault can be clearly heard on the opposite side of the chamber - has been used to achieve what could prove ...
Next generation cloaking device demonstrated
Jan 15, 2009 |
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A device that can bestow invisibility to an object by "cloaking" it from visual light is closer to reality. After being the first to demonstrate the feasibility of such a device by constructing a prototype ...
