Search results

• Cosmic background radiation
  ...mic background radiation proves that the early universe was dominated by a radiation field, a field of extremely high [[temperature]] and [[pressure]]. ...[[interacting]] with "electron" clouds [[distorting]] the spectrum of the radiation.
  2 KB (238 words) - 23:46, 12 December 2020
• Radiation
  ...and absorption of radiant [[energy]] (2) : the [[transfer]] of [[heat]] by radiation — compare conduction, convection ...[applicable]] to all [[types]] of radiation.[https://en.wikipedia.org/wiki/Radiation]
  2 KB (256 words) - 02:30, 13 December 2020
• X-ray
  *1 : any of the [https://en.wikipedia.org/wiki/Electromagnetic_radiation electromagnetic radiations] that have an extremely short [[wavelength]] of less than 100 [[ ...rer, and who had named them X-rays to signify an [[unknown]] [[type]] of [[radiation]].
  3 KB (495 words) - 02:42, 13 December 2020
• Lens
  ...gous]] device, as for affecting [[sound]] [[waves]], [[electromagnetic]] [[radiation]], or [[streams]] of [[electrons]]. ...] or [[transparent]] plastic. Elements which refract [[electromagnetic]] [[radiation]] outside the visual [[spectrum]] are also called lenses: for instance, a [
  2 KB (225 words) - 01:20, 13 December 2020
• Radio
  ...lating to [[electric]] currents or [[phenomena]] (as [[electromagnetic]] [[radiation]]) of [[frequencies]] between about 3000 hertz and 300 gigahertz ...e [[light]]. [[Electromagnetic]] radiation travels by means of oscillating electromagnetic fields that pass through the air and the [[vacuum]] of [[space]]. [[Informa
  3 KB (401 words) - 02:37, 13 December 2020
• Ultraviolet
  ...situated beyond the visible [[spectrum]] at its [[violet]] end —used of [[radiation]] having a [[wavelength]] shorter than wavelengths of visible [[light]] and ...rgies from 3 eV to 124 eV. It is so-named because the spectrum consists of electromagnetic waves with [[frequencies]] higher than those that humans identify as the co
  4 KB (573 words) - 02:41, 13 December 2020
• Penetration
  ...[[material]]. It is defined as the depth at which the [[intensity]] of the radiation inside the [[material]] falls to 1/e (about 37%) of its [[original]] [[valu ...ide the [[material]]. Depending on the [[nature]] of the [[material]], the electromagnetic field might [[travel]] very far into the material, or may die out very quic
  5 KB (795 words) - 02:36, 13 December 2020
• Accretion
  ...etic_Radiation electromagnetic radiation]. The [[frequency]] range of that radiation depends on the central object. Accretion discs of young stars and protostar
  2 KB (220 words) - 23:38, 12 December 2020
• Sunlight
  ..., sunlight is filtered through the [[Earth]]'s [[atmosphere]], and solar [[radiation]] is obvious as daylight when the Sun is above the [[horizon]]. When the direct solar radiation is not blocked by [[clouds]], it is experienced as sunshine, a combination
  2 KB (313 words) - 01:49, 13 December 2020
• Dark Matter
  ...d [https://en.wikipedia.org/wiki/Electromagnetic_radiation electromagnetic radiation], but whose [[presence]] can be [[infer]]red from [[gravitational]] [[effec ...largest part of dark matter, which does not interact with electromagnetic radiation, is not only "dark" but also, by definition, utterly [[transparent]].
  5 KB (756 words) - 23:43, 12 December 2020
• Opaque
  ...ht]]. In radiative transfer, it describes the absorption and scattering of radiation in a [[medium]], such as a [[plasma]], dielectric, shielding [[material]],
  2 KB (272 words) - 01:21, 13 December 2020
• Evanescent
  ...n the [[contexts]] of: [[optics]] and other forms of [[electromagnetic]] [[radiation]], [[acoustics]], [[quantum mechanics]], and "waves on strings".
  997 bytes (133 words) - 00:37, 13 December 2020
• Antenna
  ...io waves). In reception, an antenna intercepts some of the [[power]] of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied t ...ying fields [[radiate]] away from the antenna into [[space]] as a moving [[electromagnetic]] field wave. Conversely, during reception, the oscillating electric and ma
  4 KB (575 words) - 23:43, 12 December 2020
• Gravitational microlensing
  ...lowing study of source objects that emit any kind of [[electromagnetic]] [[radiation]].
  3 KB (422 words) - 00:11, 13 December 2020
• Medium
  **Optical '''medium''', material through which [[Electromagnetic radiation|electromagnetic waves]] propagate
  4 KB (497 words) - 22:43, 9 May 2009
• Space energies
  ...bustion and nuclear power generating systems with advanced non-polluting [[electromagnetic]] and electro-gravitic systems. The open literature is replete with well-do ...hort, the strategic [[barriers]] to the widespread adoption of these new [[electromagnetic]] energy-generating systems far exceed the [[technological]] ones. The [[pr
  3 KB (456 words) - 01:55, 13 December 2020
• Resonance
  ...of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), Electron paramagnetic resonanc ...vibrations in the object. Light and other short wavelength electromagnetic radiation is produced by resonance on an atomic scale, such as electrons in atoms. Ot
  3 KB (492 words) - 02:32, 13 December 2020
• Electron
  ...[[point particle]]. Electrons participate in [[gravity|gravitational]], [[electromagnetic]] and weak interactions. Like its rest [[mass]] and elementary charge, the ...lications, including welding, cathode ray tubes, [[electron microscopes]], radiation therapy, lasers and [[particle accelerators]].[https://en.wikipedia.org/wik
  3 KB (453 words) - 23:56, 12 December 2020
• Optics
  ...ice, the vast majority of optical phenomena can be accounted for using the electromagnetic description of light, as described by [[Maxwell's equations]]. ...pansion of paraxial optics that provides a more accurate model of coherent radiation like [[laser]] beams. While still using the paraxial approximation, this te
  7 KB (939 words) - 01:22, 13 December 2020
• Wave
  ...acuum]], including electromagnetic radiation and probably[1] gravitational radiation. Waves travel and transfer energy from one point to another, often with no ...on a string), where energy is moving in both directions equally, or for [[electromagnetic]] / light waves in a vacuum, where the concept of medium does not apply. Th
  9 KB (1,333 words) - 02:41, 13 December 2020

View (previous 20 | next 20) (20 | 50 | 100 | 250 | 500)