News tagged with electromagnetic waves

Surfboard-sized drones crossing pacific to monitor sea surface

Hundreds of miles off the California coast, four drones about the size of surfboards and are tossing across the Pacific toward Hawaii, controlled by pilots on shore.

Space & Earth / Earth Sciences

created Jan 18, 2012 | popularity 4.8 / 5 (5) | comments 1 | with audio podcast

Lightning-made waves in Earth's atmosphere leak into space

At any given moment about 2,000 thunderstorms roll over Earth, producing some 50 flashes of lightning every second. Each lightning burst creates electromagnetic waves that begin to circle around Earth captured ...

Space & Earth / Space Exploration

created Nov 29, 2011 | popularity 5 / 5 (12) | comments 7 | with audio podcast

Researchers adapt classic antennas to harness more power from the sun

Some solar devices, like calculators, only need a small panel of solar cells to function. But supplying enough power to meet all our daily needs would require enormous solar panels. And solar-powered energy collected by panels ...

Physics / General Physics

created Nov 10, 2011 | popularity 4.1 / 5 (7) | comments 0 | with audio podcast

NASA's Fermi finds youngest millisecond pulsar, 100 pulsars to date

An international team of scientists using NASA's Fermi Gamma-ray Space Telescope has discovered a surprisingly powerful millisecond pulsar that challenges existing theories about how these objects form.

Space & Earth / Astronomy

created Nov 04, 2011 | popularity 4.3 / 5 (6) | comments 2 | with audio podcast

Cooperative communications when collaborators are not synchronized

A promising way to improve future wireless communication speed is to have users and/or base stations help each other. This is called cooperative communications. One of the practical difficulties in cooperative ...

Technology / Telecom

created Oct 24, 2011 | popularity not rated yet | comments 0

Generation of spin current by acoustic wave spin pumping

Tohoku University, Japan Science and Technology Agency (JST) and Japan Atomic Energy Agency (JAEA) announced on August 22, 2011 that Kenichi Uchida, a PhD student, and Professor Eiji Saitoh of Tohoku University and their ...

Physics / General Physics

created Sep 26, 2011 | popularity 5 / 5 (1) | comments 0

Graphene may open the gate to future terahertz technologies

Nestled between radio waves and infrared light is the terahertz (THz) portion of the electromagnetic spectrum. By adding a nanoscale bit of graphene, researchers have found a better way to tune radiation for a THz transmitter.

Nanotechnology / Nanophysics

created Sep 12, 2011 | popularity 4.9 / 5 (7) | comments 11 | with audio podcast

Fusion diagnostic sheds light on plasma behavior at EAST

An instrument developed by researchers at the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL) has enabled a team at the EAST fusion experiment in China to observe--in startling detail--how a particular ...

Physics / Plasma Physics

created Aug 05, 2011 | popularity 4.3 / 5 (12) | comments 0 | with audio podcast

New invisibility cloak hides objects from human view

For the first time, scientists have devised an invisibility cloak material that hides objects from detection using light that is visible to humans. The new device is a leap forward in cloaking materials, according to a report ...

Nanotechnology / Nanophysics

created Jul 27, 2011 | popularity 3.7 / 5 (15) | comments 11 | with audio podcast

Wireless power could cut cord for patients with implanted heart pumps

Mechanical pumps to give failing hearts a boost were originally developed as temporary measures for patients awaiting a heart transplant. But as the technology has improved, these ventricular assist devices ...

Technology / Engineering

created Jul 12, 2011 | popularity 4.2 / 5 (5) | comments 5 | with audio podcast

In a major breakthrough, scientists control light propagation in photonic chips

Researchers at Columbia Engineering School have built optical nanostructures that enable them to engineer the index of refraction and fully control light dispersion. They have shown that it is possible for light (electromagnetic ...

Physics / Optics & Photonics

created Jul 10, 2011 | popularity 4.8 / 5 (18) | comments 3 | with audio podcast

Cell phone use may reduce male fertility

Men who have been diagnosed with poor sperm quality and who are trying to have children should limit their cell phone use. Researchers have found that while cell phone use appears to increase the level of testosterone circulating ...

Medicine & Health / Research

created May 19, 2011 | popularity 5 / 5 (1) | comments 0 | with audio podcast

Sharpening the nanofocus: Researchers use nanoantenna to enhance plasmonic sensing

(PhysOrg.com) -- Such highly coveted technical capabilities as the observation of single catalytic processes in nanoreactors, or the optical detection of low concentrations of biochemical agents and gases ...

Nanotechnology / Nanophysics

created May 17, 2011 | popularity 4.8 / 5 (4) | comments 2 | with audio podcast

A giant interneuron for sparse coding

A single interneuron controls activity adaptively in 50,000 neurons, enabling consistently sparse codes for odors.

Medicine & Health / Neuroscience

created May 13, 2011 | popularity 5 / 5 (7) | comments 0 | with audio podcast

NEC demonstrates Terahertz camera for effective fire scene imaging

NEC Corporation, in cooperation with The University of Tokyo and the National Institute of Information and Communications Technology, announced today the successful demonstration of terahertz wave image measurement technologies ...

Technology / Engineering

created Mar 10, 2011 | popularity 3 / 5 (2) | comments 0

Electromagnetic radiation

Electromagnetic 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.