Teoria speciale e relativitetit: Dallime mes rishikimesh
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[[File:Albert Einstein 1979 USSR Stamp.jpg|thumb|250px|Stampë poste e BRSS dedikuar Albert Ajnshtajnit]]
'''Relativiteti special''' (i njohur ndryshe si teoria speciale e relativiteti) është një teori fizike e matjes në pikat inerciale të referimit e propozuar në vitin 1905 nga Albert Ajnshtajn (pas kontribuimeve të shumta dhe të pavarura të Hendrik Lorentz, Henri Poincare dhe të tjerë) në dorëshkrimin "Elektrodinamika e trupave në lëvizje".<ref name=electro>[[Albert Einstein]] (1905) "[http://www.pro-physik.de/Phy/pdfs/ger_890_921.pdf Zur Elektrodynamik bewegter Körper]", ''Annalen der Physik'' 17: 891; English translation [http://www.fourmilab.ch/etexts/einstein/specrel/www/ On the Electrodynamics of Moving Bodies] by [[George Barker Jeffery]] and Wilfrid Perrett (1923); Another English translation [[s:On the Electrodynamics of Moving Bodies (1920 edition)|On the Electrodynamics of Moving Bodies]] by [[Megh Nad Saha]] (1920).</ref> Ajo përgjithëson parimin e relativitetit të Galileos- që e tërë lëvizja ose mocioni uniformë është relativ dhe se nuk ka asnjë gjendje absolute të prehjes (asnjë pikë referimi e privilegjuar)-nga mekanika deri te gjithë ligjet e fizikës, duke përfshirë si ligjet e mekanikë dhe ato të elektrodinamikës, sido që janë ato.<ref name=Rindler0>{{cite book |title=Essential Relativity |author= Wolfgang Rindler |page= §1,11 p. 7 |url=http://books.google.com/books?id=0J_dwCmQThgC&pg=PT148 |isbn=354007970X |publisher=Birkhäuser |year=1977 }}</ref>
This theory has a wide range of consequences which have been experimentally verified,<ref>{{cite web | url = http://www.edu-observatory.org/physics-faq/Relativity/SR/experiments.html | title = What is the experimental basis of Special Relativity? | accessdate = 2008-09-17 | author = Tom Roberts and Siegmar Schleif | year = 2007 | month = October | work = Usenet Physics FAQ}}</ref> including counter-intuitive ones such as [[length contraction]], [[time dilation]] and [[relativity of simultaneity]], contradicting the classical notion that the duration of the time interval between two events is equal for all observers. (On the other hand, it introduces the [[space-time interval]], which ''is'' invariant.) Combined with other laws of physics, the two postulates of special relativity predict the equivalence of [[matter]] and [[energy]], as expressed in the [[mass-energy equivalence]] formula ''E'' = ''mc''<sup>2</sup>, where ''c'' is the [[speed of light]] in a vacuum.<ref name=relativity>{{cite book |author=Albert Einstein |title=Relativity: The Special and the General Theory |page= 48 |url=http://books.google.com/books?id=idb7wJiB6SsC&pg=PA50 |isbn=0415253845 |publisher=Routledge |year=2001 |edition=Reprint of 1920 translation by Robert W. Lawson }}</ref><ref name=Feynman>{{cite book |title=Six Not-so-easy Pieces: Einstein's relativity, symmetry, and space-time |author=Richard Phillips Feynman |page= 68 |url=http://books.google.com/books?id=ipY8onVQWhcC&pg=PA68 |isbn=0201328429 |publisher=Basic Books |edition=Reprint of 1995 |year=1998}}</ref> The predictions of special relativity agree well with Newtonian mechanics in their common realm of applicability, specifically in experiments in which all velocities are small compared to the speed of light. Special relativity reveals that ''c'' is not just the velocity of a certain phenomenon—namely the propagation of [[electromagnetic radiation]] (light)—but rather a fundamental feature of the way space and time are unified as [[spacetime]]. One of the consequences of the theory is that it is impossible for any particle that has [[rest mass]] to be accelerated to the speed of light.
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