What are the Wavelengths of the Electromagnetic Spectrum? September 27, 2006Posted by healthyself in Blogroll, Cell phone safety, Definitions, Distribution, Electromagnetic Communications, Electromagnetic Field, Electromagnetic Interference, Electromagnetic pollution, Electromagnetic Spectrum, Electromagnetic waves, Electrosensitivity, Electrosmog, ELF, EMR, Endogenous Fields, Environment, Frequencies, Gamma Rays, Infrared, Light, Microwave exposure, mobile telephones, Noise, particle, Radio Waves, Radios, Sound, Spectrum, Telecommunications, Telephony, transmission, UHF, Ultraviolet, VDT, Visible Light, X-Rays.
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“The electromagnetic spectrum is the distribution of electromagnetic radiation according to energy (or equivalently, by virtue of the relations in the previous section, according to frequency or wavelength).”
Regions of the Electromagnetic Spectrum
“The following table gives approximate wavelengths, frequencies, and energies for selected regions of the electromagnetic spectrum.”
|Spectrum of Electromagnetic Radiation|
The notation “eV” stands for electron-volts, a common unit of energy measure in atomic physics. A graphical representation of the electromagnetic spectrum is shown in the figure below.
|The electromagnetic spectrum|
“Thus we see that visible light and gamma rays and microwaves are really the same things. They are all electromagnetic radiation; they just differ in their wavelengths.”
The Spectrum of Visible Light
The visible part of the spectrum may be further subdivided according to color, with red at the long wavelength end and violet at the short wavelength end, as illustrated (schematically) in the following figure.
|The visible spectrum|
What is the Electromagnetic Spectrum? September 21, 2006Posted by healthyself in Blogroll, Cell phone safety, Color, Definitions, Electromagnetic Field, Electromagnetic waves, Frequencies, Gamma Rays, Infrared, Light, light beam, Low Frequencies, Magnetic, MHz, Microwave exposure, Oscillate, Photons, Radio Waves, Spectrum, Visible Light.
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“..Electromagnetic radiation can be described in terms of a stream of photons, each traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy. … the only difference between radio waves, visible light, and gamma-rays is the energy of the photons. Radio waves have photons with low energies, microwaves have a little more energy than radio waves, infrared has still more, then visible, ultraviolet, X-rays, and gamma-rays.”"Actually, the amount of energy a photon has makes it sometimes behave more like a wave and sometimes more like a particle. This is called the “ wave-particle duality” of light. …only in how it behaves. Low energy photons (such as radio) behave more like waves, while higher energy photons (such as X-rays) behave more like particles. …the electromagnetic spectrum can be expressed in terms of energy, wavelength, or frequency. Each way of thinking about the EM spectrum is related to the others in a precise mathematical way. The relationships are:
the wavelength equals the speed of light divided by the frequency
lambda = c / nu” http://imagine.gsfc.nasa.gov/docs/science/know_l2/emspectrum.html
Light, Color and Electromagnetic Frequency September 21, 2006Posted by healthyself in 430 Trillion Hz-750 Trillion Hz, Auric Field, Beneficial frequencies, BioPhotons, Blogroll, Cell phone safety, Color, Electromagnetic Field, Electromagnetic Spectrum, Electromagnetic waves, Energy, Gamma Rays, Light, Low Frequencies, Oscillate, Penetration, Quantum Physics, Radio Waves, Red, Resonance, Spectrum, Subtle Energies, Transformation, vacuum, Vibration, Vibrational Medicine, Violet, Visible Light, Waves.
…”The scientific notion of photons begins with the fact that these elementary particles of energy display two seemingly contradictory behaviors: One behavior has to do with how they act as members of a group (in a wavefront) and the other relates to how they behave in isolation (as discrete particles).”
“An individual photon may be thought of as a packet of waves cork-screwing rapidly through space. Each packet is an oscillation along two perpendicular axes of force – the electrical and the magnetic. Because light is an oscillation, wave-particles interact with each other.
“One way of understanding the dual-nature of light is to realize that wave after wave of photons affect our telescopes – but individual photons are absorbed by the neurons in our eyes.”…….. “Stars (such as our Sun) exist because space-time does more than simply transmit light as waves. Somehow – still unexplained-1 – space-time causes matter too. And one thing distinguishing light from matter is that matter has “mass” while light has none….”
….”In relationship to light, matter can be opaque or transparent – it can absorb or refract light. Light can pass into matter, through matter, reflect off matter, or be absorbed by matter. When light passes into matter, light slows – while its frequency increases. When light reflects, the path it takes changes. When light is absorbed, electrons are stimulated potentially leading to new molecular combinations. But even more significantly, when light passes through matter – even without absorption – atoms and molecules vibrate the space-time continuum and because of this, light can be stepped down in frequency….”
…”In addition to describing the gravitational effects of matter on space-time, Einstein performed an extremely elegant investigation into the influence of light associated with the photo-electric effect. Before Einstein, physicists believed light’s capacity to affect matter was based primarily on “intensity”. But the photo-electric effect showed that light effected electrons on the basis of frequency as well…….In addition to describing the gravitational effects of matter on space-time, Einstein performed an extremely elegant investigation into the influence of light associated with the photo-electric effect.. showed that light effected electrons on the basis of frequency as well. Thus red light – regardless of intensity – fails to dislodge electrons in metals, while even very low levels of violet light stimulate measurable electrical currents. Clearly the rate at which light vibrates has a power all its own.”
“Light waves also come in many frequencies. The frequency is the number of waves that pass a point in space during any time interval, usually one second. It is measured in units of cycles (waves) per second, or Hertz (Hz). The frequency of visible light is referred to as color, and ranges from 430 trillion Hz, seen as red, to 750 trillion Hz, seen as violet. Again, the full range of frequencies extends beyond the visible spectrum, from less than one billion Hz, as in radio waves, to greater than 3 billion billion Hz, as in gamma rays.”
“As noted above, light waves are waves of energy. The amount of energy in a light wave is proportionally related to its frequency: High frequency light has high energy; low frequency light has low energy. Thus gamma rays have the most energy, and radio waves have the least. Of visible light, violet has the most energy and red the least.”
“Light not only vibrates at different frequencies, it also travels at different speeds. Light waves move through a vacuum at their maximum speed, 300,000 kilometers per second or 186,000 miles per second, which makes light the fastest phenomenon in the universe. Light waves slow down when they travel inside substances, such as air, water, glass or a diamond. The way different substances affect the speed at which light travels is key to understanding the bending of light, or refraction…”
“So light waves come in a continuous variety of sizes, frequencies and energies. We refer to this continuum as the electromagnetic spectrum …visible light occupies only one-thousandth of a percent of the spectrum.”