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- ...sup>?: (and why should we care?) |page=2}}</ref> A [[photon]] (particle of light) travels at this speed in a [[vacuum]]. ...field (physics)|field]]s—including [[electromagnetic radiation]] such as [[light]]—in a vacuum. ...14 KB (2,294 words) - 20:34, 22 December 2024
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- ...nd all object sizes. If the object is much smaller than the wavelength of light, [[Rayleigh scattering]] theory is also quite good. When the object is big, the light can hit many places on the object. A quite good formula for the scattering ...581 bytes (95 words) - 13:37, 12 March 2013
- The most common examples include the reflection of [[light]], [[sound]] and [[Mechanical wave|water waves]]. ...e through point O that is at 90˚ to the mirror. The [[angle]]s made by the light ray (shown in the diagram as <math>\theta _i</math> and <math>\theta _r</ma ...1 KB (223 words) - 02:00, 3 November 2024
- ...iewing at a certain angle, the straw appears to bend, due to refraction of light as it moves into the air]] [[File:Refraction photo.png|thumb|A [[ray (optics)|ray]] of light being refracted in a plastic block.|alt=refer to caption]] ...3 KB (537 words) - 19:11, 15 March 2024
- === Light === ...then a photon with energy ''y'' is emitted by the atom and either becomes light or some other form of [[radiation]]. ...2 KB (279 words) - 15:14, 30 July 2024
- ...of light or a fire hose spraying water, we need to know how many units of light or water are coming to some area in some period of time. A [[factory]] migh ...1 KB (199 words) - 18:09, 19 June 2022
- [[Image:Snells law2.svg|thumb|180px|[[Refraction]] of light at the interface between two media of different [[refractive index|refracti [[File:Fénytörés.jpg|thumb|A ray of light hits a glass prism and is refracted]] ...2 KB (356 words) - 16:24, 4 December 2024
- [[Particles]] which go near the [[speed of light]] are called '''ultrarelativistic'''. Einstein then went on to show that a particle can never achieve the speed of light, because you get a [[divide by zero error]] from the equation for [[kinetic ...2 KB (268 words) - 19:13, 21 March 2013
- ...to [[watt]]s. A watt is one unit of [[Power (physics)|power]]. Just as a [[light bulb]] is measured in watts, the [[Sun]] can also be measured in watts. The ...distance. The apparent magnitude is the less, for objects more than 32.6 light years away. ...1 KB (222 words) - 20:09, 24 September 2022
- .... An image is created of the spectrum of light with black breaks where the light has been absorbed. These breaks are called absorption lines, and every elem ...n|electrons]] in the [[atom|atoms]] of the sample - an electron can absorb light to gain energy. From experiments, electrons only ever absorb certain amount ...4 KB (583 words) - 04:30, 12 July 2022
- A '''stellar-wind bubble''' is a cavity [[Light-year|light-years]] across filled with hot gas blown into the [[interstellar medium]] b ...NGC 7635), imaged by the [[Hubble Space Telescope]], is seven [[Light year|light years]] across]] ...2 KB (236 words) - 21:49, 10 October 2023
- ...light bulb. So it costs more to run a bright bulb for a minute than a dim light bulb. A modern LED light bulb might take 5 Watts of power. A kettle while it is boiling might take ...2 KB (400 words) - 10:31, 8 February 2025
- ...it demonstrates the pressure of hot air that is heated by the energy that light carries to a black surface.]] ...orbed, the pressure is the energy [[flux]] density divided by the speed of light. If the radiation is totally reflected, the radiation pressure is doubled. ...3 KB (407 words) - 00:36, 13 April 2024
- ...light at a higher frequency will have more energy (and be associated with light at a shorter wavelength). ...ntum]]. Before the photon got its name, Einstein revived the proposal that light is separate pieces of energy (particles). These particles came to be known ...5 KB (749 words) - 18:08, 2 January 2024
- ...tion''' is a process where a [[molecule]] absorbs ultraviolet or visible [[light]] that excites [[electrons]] (makes them high [[energy]]). This energy caus ...molecules will absorb different wavelengths of light. The wavelengths of light for UV-visible absorption are from about 200 nanometers to 800 nanometers. ...5 KB (713 words) - 15:19, 17 February 2024
- ...wave]] or water wave. Until the 20th century, most physicists thought that light was either one or the other, and that the scientists on the other side of t ...holes, it created an ''[[interference]] pattern'' that seemed to show that light was actually a wave. ...5 KB (828 words) - 22:53, 9 April 2024
- ...le]]. Once a [[compact star|stellar remnant]] collapses below this radius, light can no longer escape and the object is no longer visible.<ref>Chaisson, Eri .../sup>/kg<sup>2</sup>, M is the mass of the object, and c is the [[speed of light]] which is 299,792,458 m/s. ...2 KB (269 words) - 20:14, 22 July 2024
- ...and [[mass]] change for an object moving at speeds close to the [[speed of light]] (relativistic speeds). It is named after the [[Dutch people|Dutch]] physi where v is the speed of the object and c is the speed of light. The quantity (v/c) is often labeled <math>\beta</math> (beta) and so the a ...3 KB (557 words) - 00:35, 23 February 2025
- ...ht waves is '''<math>f = c/\lambda</math>''' where the c is the [[speed of light]].<ref>{{cite web|url=http://www.sciencescope.co.uk/frequency_of_a_wave.htm All [[electromagnetic waves]] travel at the speed of light in a [[vacuum]] '''but''' they travel at slower speeds when they travel thr ...4 KB (629 words) - 12:33, 19 November 2022
- ...oes Light Travel? {{!}} The Speed of Light|url=https://www.space.com/15830-light-speed.html|archive-url=|archive-date=|access-date=2020-08-16|website=Space. ...2 KB (358 words) - 14:54, 2 December 2024
- ...e frame, <math>t</math> representing time, and <math>c</math> the speed of light. ...city (shallower gradient resulting in a greater velocity). If the speed of light is set as a 45° or 1:1 gradient, Lorentz transformations can rotate and squ ...1 KB (222 words) - 21:04, 10 June 2022