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'''Yahoo Music Engine''' is a free music player released by [[Yahoo]] in [[2005]]. The features are currently complete, although the player is still considered to be in the [[Development stage|Beta stage]] due to minor, miscellaneous glitches. Its appearance is somewhat similar to the ''[[MusicMatch Jukebox]]''. This may be related to the fact that MusicMatch, which developed the Jukebox, was purchased by Yahoo in 2004.
The '''weak nuclear force''' or '''weak interaction''' is one of the four [[fundamental force]]s of nature. It is most commonly seen in [[beta decay]] and the associated [[radioactivity]]. The predicate ''weak'' derives from the fact that the field strength is some 10<sup>9</sup> times less than that of the [[strong nuclear force]]. The term ''nuclear'' indicates that it is a short-range force, limited to distances smaller than an atomic nucleus.
Its features include CD [[ripping]] and [[CD/DVD authoring|burning]], access to [[Launcast]] and [[Yahoo Unlimited]], playlist creation, transfer of music to portable devices such as [[digital audio player|mp3 players]] and [[USB flash drive]]s. Also the program allows [[Yahoo Messenger]] users to [[streaming media|stream]] music to one another (not to be confused with [[uploading and downloading]] or [[filesharing]]) and browse one another's playlists. Only those subscribed to Yahoo Ultimate are entitled to entire songs, however. Non-subscribers are limited to a thirty second sample.
==Properties==
The weak nuclear force affects all [[lepton]]s and [[quarks]]. It is the only force affecting [[neutrino]]s (except for gravitation, which is negligible on laboratory scales). The weak interaction enables all lepton and quark particles and antiparticles to interchange [[energy]], [[mass]], [[electric charge]] and [[Flavor (particle physics)|flavor]]—effectively to change into each other.
One can rip songs in a variety of formats including [[WAV|.wav]], [[MP3|.mp3]], and [[WMV|.wmv]]. Interestingly, one cannot rip songs in the [[WMA|.wma]] format, despite the fact that songs purchased from Yahoo are encoded using that format.
Although the weak nuclear force used to be described by [[Fermi's theory]] of a contact four-[[fermion]] interaction, today we know that it is mediated by the [[W and Z bosons]]. Because of their large mass of about 90 GeV/c<sup>2</sup>, their [[half-life|mean life]] is limited to about <math>3 \times 10^{-25}</math>seconds by the [[uncertainty principle]]:
:<math>\Delta E\cdot\Delta t\geq\hbar/2</math>
Even at the speed of light this effectively limits the range of the weak nuclear force to <math>10^{-18}</math>meters, or about 1000 times smaller than the diameter of an [[atomic nucleus]].
The Engine also has a great deal of [[plugin]]s, which reside on the program's official website below.
The [[physical law|laws of nature]] were long thought to remain the same under mirror reflection. The results of an experiment viewed via a mirror were expected to be identical to the results of a mirror-reflected copy of the experimental apparatus. This is called the law of [[parity]] conservation in physicists' jargon. However, in the mid-1950's [[Chen Ning Yang]] and [[Tsung-Dao Lee]] suggested that the weak interaction might violate this law. [[Chien Shiung Wu]] and collaborators confirmed this prediction in 1957, earning Yang and Lee the [[Nobel Prize in Physics#1950s|1957 Nobel Prize in Physics]]. In 1957, Robert Marshak and [[George Sudarshan]] and, somewhat later, [[Richard Feynman]] and [[Murray Gell-Mann]] proposed a V-A Lagrangian for weak interactions.
The [[Standard Model]] of particle physics describes the [[electromagnetic force]] and the weak nuclear force as two different aspects of a single [[electroweak force]], the theory of which was developed around 1968 by [[Sheldon Glashow]], [[Abdus Salam]] and [[Steven Weinberg]] (more at [[W and Z bosons]]). They were awarded the [[Nobel Prize in Physics#1970s|1979 Nobel Prize in Physics]] for their work.
*[http://music.yahoo.com/musicengine Yahoo! Music Engine Official Site]
*[http://plugins.yme.music.yahoo.com Yahoo! Music Engine Plug-ings]
[[Category: NuclearWindows physicsmedia players]] ▼==See also ==
* [[Standard model (basic details)|Formulation of the standard model]].
* [http://www.nobel.se/physics/laureates/1957/ Citation] for 1957 Nobel Prize
* [http://www.nobel.se/physics/laureates/1979/ Citation] for 1979 Nobel Prize
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▲[[Category:Nuclear physics]]
[[Category:Particle physics]]
[[Category:Electroweak theory]]
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