Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Electromagnetic radiation

Related Topics

In the News (Wed 17 Apr 19)

  Electromagnetic radiation - Wikipedia, the free encyclopedia
The physics of electromagnetic radiation is electrodynamics, a subfield of electromagnetism.
EM radiation with a wavelength between approximately 400 nm and 700 nm is detected by the human eye and perceived as visible light.
Electromagnetic waves as a general phenomenon were predicted by the classical laws of electricity and magnetism, known as Maxwell's equations.
en.wikipedia.org /wiki/Electromagnetic_radiation   (2104 words)

 Electromagnetic radiation Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: 2007-10-22)
Electromagnetic radiation is a combination of oscillating electric and magnetic fields propagating through space and carrying energy from one place to another.
The theoretical study of electromagnetic radiation is called electrodynamics, a subfield of electromagnetism.
Generally, electromagnetic radiation is classified by wavelength into radio, microwave, infrared light, visible light, ultraviolet light, X-rays and gamma rays.
www.wikiwhat.com /encyclopedia/e/el/electromagnetic_radiation.html   (366 words)

 Olympus Microscopy Resource Center: Light and Color - Electromagnetic Radiation
Electromagnetic radiation, the larger family of wave-like phenomena to which visible light belongs (also known as radiant energy), is the primary vehicle transporting energy through the vast reaches of the universe.
The term electromagnetic radiation, coined by Sir James Clerk Maxwell, is derived from the characteristic electric and magnetic properties common to all forms of this wave-like energy, as manifested by the generation of both electrical and magnetic oscillating fields as the waves propagate through space.
A standard measure of all electromagnetic radiation is the magnitude of the wavelength (in a vacuum), which is usually stated in units of nanometers (one-thousandth of a micrometer) for the visible light portion of the spectrum.
www.olympusmicro.com /primer/lightandcolor/electromagintro.html   (4927 words)

 electromagnetic radiation. The Columbia Encyclopedia, Sixth Edition. 2001-05
He showed that the speed of propagation of electromagnetic radiation should be identical with that of light, about 186,000 mi (300,000 km) per sec.
Light is a type of electromagnetic radiation, occupying only a small portion of the possible spectrum of this energy.
According to the quantum theory, light and other forms of electromagnetic radiation may at times exhibit properties like those of particles in their interaction with matter.
www.bartleby.com /65/el/electrom-r.html   (375 words)

 Radiation Safety
Radiation is an energy transfer from one place to another in waveform, and some of its effects are essential to the existence of life on earth.
Electromagnetic radiation is arranged according to frequency in a continuum that is called the electromagnetic spectrum
The electromagnetic spectrum is divided into two primary regions: ionizing and non-ionizing radiation, depending on the wavelength and frequency.
www.pc.ibm.com /ww/healthycomputing/vdt14.html   (503 words)

 Electromagnetic Radiation: Field Memo
Radiated power is that power given off by a radiation source (antenna) and carried through space by the EM wave.
Yet, electromagnetic radiation is exactly that, electrical energy moving through space as a wave, and electrical energy in a wire is a special case in which the energy is guided by a wire.
Polarization of a radiated wave is "That property of a radiated electromagnetic wave describing the time-varying direction and amplitude of the electric field vector: specifically, the figure traced as a function of time by the extremity of the vector at a fixed 1 location in space, as observed along the direction of propagation."
www.osha.gov /SLTC/radiofrequencyradiation/electromagnetic_fieldmemo/electromagnetic.html   (8300 words)

 Many people report symptoms of electromagnetic radiation sickness, WHO   (Site not responding. Last check: 2007-10-22)
Symptoms of electromagnetic radiation sickness are for example sleep disturbances, dizziness, heart palpitations, headache, blurry sight, swelling, nausea, a burning skin, vibrations, electrical currents in the body, pressure on the brest, cramps, high blood pressure and general unwell-being.
The symptoms of electromagnetic radiation sickness should be interpreted as the consequences of stress by the introduction of new technologies.
Scientifically the harmfulness of electromagnetic radiation is proven, based on the many testimonies and anamneses, epidemiological research and most of the laboratory and provocative research.
www.medicalnewstoday.com /medicalnews.php?newsid=30499   (1513 words)

 electromagnetic radiation on Encyclopedia.com
ELECTROMAGNETIC RADIATION [electromagnetic radiation] energy radiated in the form of a wave as a result of the motion of electric charges.
Electromagnetic radiation and health risks: cell phones and microwave radiation in New Zealand.
Electromagnetic pollution and a prescription for survival: a battle of the century.
www.encyclopedia.com /html/e1/electrom-r.asp   (533 words)

 Electromagnetic Radiation   (Site not responding. Last check: 2007-10-22)
Electromagnetic radiation is a kind of radiation that includes visible light (the light that we see), radio waves, gamma rays, X-rays and other forms of radiation in which the electric and magnetic fields vary simultaneously.
Electromagnetic radiation is divided into different types according to an electromagnetic spectrum.
Shorter wavelengths, such as gamma rays, x-rays, and ultraviolet radiation, are less than 400 nm long, while long wavelengths, such as infrared radiation (heat), microwaves, radar, TV signals, and long-wave radio signals are greater than 700 nm and may be longer than a kilometer.
www.oceansonline.com /radiation.htm   (1218 words)

 Part I - Electromagnetic Radiation   (Site not responding. Last check: 2007-10-22)
Electromagnetic radiation is defined as electric and magnetic energy, or fields, traveling through space.
Physicists describe such radiation in terms of its strength (the force the electric and magnetic fields exert) and its frequency (the number of times per second that the fields change direction or polarity).
Electromagnetic radiation at frequencies beginning at visible light and proceeding downward is called non-ionizing radiation.
www.noradcorp.com /1tutor.htm   (636 words)

A crucial part of the hypothesis on Bharat radiation was in proving the existence of an energy gap not previously known to scientists in the electromagnetic spectrum between X-ray and UV regimes as the place for Bharat radiation.
Bharat radiation and Energy Dependent Atomic Spectrum are the first and second generations of beta, gamma and X-radiations within excited atoms in radioisotopes and XRF sources.
Bharat radiation is daughter radiation of ionizing radiation particularly beta, gamma and X-radiations, a fact which was not known previously.
www.geocities.com /raomap/discovery4.html   (897 words)

 Electromagnetic Radiation
Electromagnetic (EM) radiation is defined as fluctuating fields of electrical and magnetic energy, travelling through space, or through suitable media, as electromagnetic waves.
Whenever an alternating electric current is applied to an electric conductor, the movement of the electricity inside the conductor creates electric and magnetic fields which propagate, or radiate outward, into the space around the conductor.
The NRPB is an independent statutory body responsible for advising the UK government departments and others on standards of protection for exposure to ionising and non-ionising radiation, which includes electric and magnetic fields.
www.spelthorne.gov.uk /environment___planning/pollution/env_electromagnetic_radiation.htm   (366 words)

 Electromagnetic Radiation Manuscript @ NaturalResearch.org (Natural Research)   (Site not responding. Last check: 2007-10-22)
In addition, frequency affects properties like refraction, in which different frequencies undergo a different level of refraction.
As a wave, it is characterized by a velocity (the speed of light), wavelength, and frequency.
The coded form of such data is similar to that used with radio waves.
www.naturalresearch.org /encyclopedia/Electromagnetic_radiation   (1443 words)

 CHP - Electromagnetic Radiation
Electromagnetic radiation consists of discrete packets of energy, which we call photons.
The electromagnetic nature of all photons is the same, but photons can have different frequencies.
The names we give electromagnetic radiation for different wavelength and frequency ranges are listed in the electromagnetic spectrum document.
www.chem.vt.edu /chem-ed/light/em-rad.html   (603 words)

 *NZine* The Electromagnetic Radiation Health Threat - Part I * Electromagnetic Radiation, cancer, leukaemia, health, ...   (Site not responding. Last check: 2007-10-22)
Electromagnetic radiation is the big issue he is involved in at the moment—radio waves from radio and TV towers, microwaves from cell phones, cell sites, mobile phones, cordless phones, and microwave ovens (the last being a minor problem compared with the others).
The official position of those who make their money out of producing and using this technology is that we all know that the only thing that electro magnetic radiation can do is heat and if it doesn't heat it can't have any effect.
In spite of this research one "world expert" in electromagnetic radiation and health has said that the worst thing about a cell phone is that it can cause an interruption during dinner in a restaurant.
www.nzine.co.nz /features/neilcherry.html   (1588 words)

 Electromagnetic Radiation Spectrum (Definitrions, Sources, Symptoms, Testing Equipment & Procedures, Exposure ...
Electromagnetic Radiation Spectrum (0Hz to 10^27 Hz) (Definitions, Physics, and Properties, Sources of Radiation, Overexposure Symptoms, Testing Equipment and Procedures, Exposure Limits, Standards and Laws, Shielding and Jamming, Medical and Technical Protection, EMF Agencies, Organizations To Contact For Help, Reference Materials) * 2.
Radiation refers to the transmutation of energy in the form of waves and of streams of atomic particles through space.
Electromagnetic brain waves (0.1 to 30hz) occur at frequencies paralleling those of terrestrial sferics and the Schuman resonance.
www.rhfweb.com /hweb/shared2/Newrad.html   (4270 words)

 Neurological Effects of Radiofrequency Electromagnetic Radiation Relating to Wireless Communication Technology
Unlike the conditions in most previous research on the biological effects of RFR in which whole body exposure was studied, the effects of cellular telephone-related exposure involve repeated exposure with variable durations of a relatively constant amount of body tissue (i.e., part of the head).
In considering the biological effects of RFR, the intensity and frequency of the radiation and exposure duration are important determinants of the responses.
The 500 pps radiation was found to be significantly more effective in increasing the concentration of NADH in the cerebral cortex than the 250 pps radiation.
www.mapcruzin.com /radiofrequency/henry_lai1.htm   (8241 words)

 Electromagnetic Radiation   (Site not responding. Last check: 2007-10-22)
Electromagnetic waves are produced by the motion of electrically charged particles.
These waves are also called "electromagnetic radiation" because they radiate from the electrically charged particles.
Scientists have observed that electromagnetic radiation has a dual "personality." Besides acting like waves, it acts like a stream of particles (called "photons") that have no mass.
www.lbl.gov /MicroWorlds/ALSTool/EMSpec/EMSpec.html   (157 words)

They are unified by thinking of them as "electromagnetic waves," waves of alternating strength in electric and magnetic fields that all move through space at the "speed of light" (called "c") of 300,000 kilometers per second (186,000 miles per second), eight times around the Earth in the tick of a clock.
Visual radiation is in the middle, with wavelengths that extend from 0.00004 centimeters for violet light to about 0.00007 centimeters for extreme red.
Such flowing gas has a low density and radiates emission lines that are superimposed on the spectrum of the double and give away the fact that the stars are interacting.
www.astro.uiuc.edu /~kaler/sow/spectra.html   (5857 words)

 Electromagnetic Radiation Explained - by Jim Hawkins (WA2WHV)
At the same time, books on electromagnetics present the needed laws of field behavior to explain wave propagation, but are so advanced that it can be difficult for us to relate what we are learning to radiation.
In order for radiation to be able to occur, we have to prove that magnetic and electric fields can exist without the presence of a nearby current and that these fields will "move" through space.
When the voltage and current are observed at the terminals of a radiating conductor or antenna, one component of alternating current is 90 degrees out of phase with the alternating voltage and another component is in phase with the alternating voltage.
hawkins.pair.com /eRadiation.html   (2720 words)

 [No title]   (Site not responding. Last check: 2007-10-22)
Electromagnetic (EM) radiation is a form of energy, i.e., it has the ability to perform work.
The disturbance generated a wave which moved away from the point of the disturbance and it was the wave which carried the information that the earthquake (disturbance) occured.
The preceding discussion was in a sense an operational definition of electromagnetic radiation; it defined electromagnetic radiation by the way it behaved (and by what it did).
zebu.uoregon.edu /~imamura/208/jan9/em.html   (478 words)

Try your search on: Qwika (all wikis)

  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.