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Ljusets hastighet Ταχύτητα του φωτός Vitesse de la lumière Velocidade da luz Lichtgeschwindigkeit Rychlost světla 빛의 속력 Velocidad de la luz Luas an tsolais Prędkość światła Швидкість світла Speed of light Скорость света Laju cahaya 光速 Lichtsnelheid سرعة الضوء Lumrapido Velocitat de la llum Argiaren abiadura Velocità della luce 光速
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Η ταχύτητα του φωτός είναι η ταχύτητα με την οποία το φως διαδίδεται στο κενό ή σε άλλα μέσα. Η ταχύτητα του φωτός στο κενό που συμβολίζεται συνήθως με c, είναι 299.792.458 m/s (μέτρα το δευτερόλεπτο) σε μονάδες SI, δηλαδή κατά προσέγγιση 300.000 χιλιόμετρα το δευτερόλεπτο ή σε επιστημονική μορφή 3·108m/s. Η ταχύτητα του φωτός στο «κενό» θεωρείται η μέγιστη ταχύτητα που μπορεί να αναπτυχθεί, όχι μόνο από το φως αλλά και από τα υπόλοιπα ηλεκτρομαγνητικά κύματα, άλλες μορφές μετάδοσης ενέργειας και από σωματίδια χωρίς μάζα. Η ταχύτητα αυτή είναι τόσο μεγάλη, ώστε αν ένας παρατηρητής κινούταν γύρω από τον ισημερινό της γης με αυτή την ταχύτητα θα ολοκλήρωνε το γύρω του κόσμου σε 13 εκατοστά του δευτερολέπτου. Άλλο παράδειγμα είναι ότι το φως του ήλιου φτάνει στη γη μετά από 8 λεπτά και 20 δευ De lichtsnelheid is de snelheid waarmee het licht en andere elektromagnetische straling zich voortplanten. In vacuüm heeft de lichtsnelheid (in SI-eenheden) voor alle frequenties de waarde c = 299 792 458 m/s. Ско́рость све́та в вакууме — абсолютная величина скорости распространения электромагнитных волн, в точности равная 299 792 458 м/с (или приблизительно 3×108 м/с). В физике традиционно обозначается латинской буквой «» (произносится как «цэ»), от лат. celeritas (скорость). Швидкість світла — фізичний термін, який використовують у двох, пов'язаних між собою, однак концептуально різних значеннях. Насамперед, швидкість світла — фундаментальна фізична стала, швидкість розповсюдження електромагнітної взаємодії у вакуумі. Інше значення — швидкість розповсюдження електромагнітних хвиль, включно зі світлом, у певному середовищі. Argiaren abiadura definitzeko, argia hutsean hedatzen denean daraman abiaduratik hasi beharra dago eta, hortik aurrera, argiaren abiadura definitu. Argia hutsean hedatzen denean, haren abiadura bat da, 299.792.458 ko balioa duena eta ikurraren bidez adierazten dena. Hutsa ez den ingurune batean, ordea, argiaren abiadura hutseko abiadura baino txikiagoa da, eta zenbait ezaugarriren menpekoa da, besteak beste, , eta beste ezaugarri magnetiko batzuen menpekoa. 빛의 속력(영어: speed of light) 또는 광속은 진공에서 299,792,458 m/s라는 정확한 값이며, 국제적으로 라고 표기한다. 빛의 속력은 기본 물리 상수로, 길이 단위인 미터는 이것으로부터 정의되었다. 특수 상대성 이론에 따르면, c는 우주의 모든 에너지, 물질, 정보가 가질 수 있는 속도의 최댓값이며, 최근 이론에 따르면 중력파의 속력이기도 하다. 질량이 없는 입자와 장(場; 빛과 같은 전자기 복사를 포함한다)은 c로 진행하며, 관성계에서는 관찰자의 속도와 관계없이 입자와 파동은 c로 진행한다. 상대성 이론에 따르면, c는 시간과 공간을 연관시키며, 질량-에너지 등식 E=mc²에도 등장한다. 특수 상대성 이론에 따르면 모든 움직임, 즉 물질의 이동 속도는 물론, 질량을 가진 게이지 보손도 빛의 속력보다 더 빨리 움직일 수 없다. 오직 불변 질량이 0인 물체(예를 들면 광자)만이 빛의 속력으로 전파될 수 있다. The speed of light in vacuum, commonly denoted c, is a universal physical constant that is important in many areas of physics. The speed of light c is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour). According to the special theory of relativity, c is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space. Prędkość światła w zależności od kontekstu może oznaczać: * prędkość fali elektromagnetycznej w próżni i wynikającą z tego stałą fizyczną (c = 299 792 458 m/s), * prędkość światła w ośrodkach materialnych. سرعة الضوء في الفراغ هي ثابت فيزيائي هام في العديد من مجالات الفيزياء، يرمز له في العادة بالرمز c وتساوي قيمته 299,792,458 متر لكل ثانية. تستخدم سرعة الضوء حاليا لتعريف وحدة المتر باعتبارها ثابتا فيزيائيا ومعيارا دوليا لقياس الوقت. وهو ما يعادل بعد التقريب لثلاثة أرقام معنوية 300,000 كيلومتر في الثانية أو حوالي مليار كيلومتر لكل ساعة. Tairiseach fisiciúil é luas an tsolais san fholús, agus é tábhachtach ina lán brainsí eolaíochta. Is é an tsiombail a sheasann dó sna foirmlí matamaitice ná c, agus is ionann é agus 299,792,458 méadar in aghaidh an tsoicind. Is luach cruinn é seo, nó is de réir na huimhreach seo a shainítear an méadar mar aonad faid. Lumrapido, kies kutima simbolo estas c (kaj ankaŭ c0), estas baza fizika konstanto. Ĝi estas la rapido de lumo kaj de ĉiu speco de elektromagneta radiado en vakuo, la rapido de senmasaj partikloj kaj la maksimuma ebla rapido de transportiĝo de energio kaj de informo. Ĝi egalas ekzakte al 299 792 458 metroj en sekundo. Ofte oni citas la proksimuman valoron 300 000 kilometroj en sekundo. Rychlost světla (nebo jiného elektromagnetického záření) ve vakuu (stručně též „světelná rychlost“ bez nutnosti uvádět ještě „ve vakuu“) je definována jako fázová rychlost postupného elektromagnetického vlnění ve vakuu. V soustavách jednotek založených na metrickém systému (tedy i SI) má vzhledem k definici metru přesnou hodnotu 299 792 458 metrů za sekundu (1 079 252 848,8 km/h). Označuje se podle uvedené normy ISO/IEC značkou , často však jen písmenem c, které norma ponechává pro rychlost světla v látkovém prostředí (značka je pravděpodobně odvozena z latinského celeritas, což znamená rychlost, nebo z constans, znamenající konstanta). In fisica la velocità della luce è la velocità di propagazione di un'onda elettromagnetica e di una particella libera senza massa. Nel vuoto ha un valore di 299792458 m/s. Viene indicata normalmente con la lettera c (dal latino celeritas), scelta fatta per primo da Paul Drude nel 1894. Dal 21 ottobre 1983 si considera il valore come esatto, ovvero senza errore, e a partire da esso si definisce la lunghezza del metro nel Sistema Internazionale. La velocitat de la llum en el buit, comunament representada amb la lletra c, és una constant física universal important en molts camps de la física. El seu valor és exactament 299 792 458 metres per segon, un valor exacte perquè la longitud del metre es defineix a partir d'aquesta constant i la definició estàndard internacional de segon. D'acord amb la relativitat especial, c és la velocitat màxima a la qual pot viatjar tota l'energia, la matèria i la informació de l'univers. És la velocitat a la qual totes les i els seus camps associats (inclosa la radiació electromagnètica, com la llum) viatgen en el buit. És també la (és a dir, de les ones gravitatòries) predita per les teories actuals. Aquestes partícules i ones viatgen a c, independentment del moviment de la font o el sistema de ref Ljusets hastighet (betecknas c) är egentligen två olika hastigheter: 1. * den högsta möjliga hastigheten för informationsöverföring enligt relativitetsteorin, en grundläggande egenskap hos rumtiden. 2. * hastigheten för elektromagnetisk strålning, baseras på elektriska och magnetiska egenskaper hos ett medium. I vakuum är de lika stora. I andra medier utbreder sig strålningen långsammare. La velocidad de la luz en el vacío es una constante universal con el valor de 299 792 458 m/s,​​aunque suele aproximarse a 3·108 m/s. Se simboliza con la letra c, proveniente del latín celéritās (en español, celeridad o rapidez). Laju cahaya atau kecepatan cahaya disimbolkan dengan c adalah sebuah konstanta fisika universal yang penting dalam banyak bidang fisika. Nilai presisinya adalah 299.792.458 meter per detik (kira-kira 3,00×108 m/s), karena panjang meter didefinisikan berdasarkan konstanta ini dan standar internasional waktu. Kelajuan ini merupakan kelajuan maksimum yang dapat dilajui oleh segala bentuk energi, materi, dan informasi dalam alam semesta. Kelajuan ini merupakan kelajuan segala partikel tak bermassa dan medan fisika, termasuk radiasi elektromagnetik dalam vakum. Kelajuan ini pula menurut teori modern adalah kelajuan gravitasi (kelajuan dari gelombang gravitasi). Partikel-partikel maupun gelombang-gelombang ini bergerak pada kelajuan c tanpa tergantung pada sumber gerak maupun kerangka acuan iner A velocidade da luz no vácuo, simbolizada pela letra c, é, por definição, igual a 299 792 458 metros por segundo. O símbolo c origina-se do latim celeritas, que significa velocidade ou rapidez. A velocidade da luz em um meio material transparente, tal como o vidro ou o ar, é menor que c, sendo a fração função do índice de refração do meio. Unter der Lichtgeschwindigkeit ( nach lat. celeritas: Schnelligkeit) versteht man meist die Ausbreitungsgeschwindigkeit von Licht im Vakuum. Neben Licht breiten sich auch alle anderen elektromagnetischen Wellen sowie auch Gravitationswellen mit dieser Geschwindigkeit aus. Sie ist eine fundamentale Naturkonstante, deren Bedeutung in der speziellen und allgemeinen Relativitätstheorie weit über die Beschreibung der elektromagnetischen Wellenausbreitung hinausgeht. 光速(こうそく、(英: speed of light)、あるいは光速度(こうそくど)とは、光が伝播する速さのことである。真空中における光速の値は 299792458 m/s(約30万 km/s)と定義されている。この速度においては、太陽から地球まで約8分19秒、月から地球まで2秒もかからない。俗に「1秒間に地球を7周半回ることができる速さ」とも表現される。 以下で単に「光速」と言うとき、真空中の光速を指して使うことがある。 光速は宇宙における最大速度であり、物理学において時間と空間の基準となる特別な意味を持つ値でもある。 現代の国際単位系では長さの単位メートルは光速と秒により定義されている。光速度は電磁波の伝播速度でもあり、マクスウェルの方程式で媒質を真空にすると光速が一定となるということが相対性理論の根本原理の由来になっている。 重力作用も光速で伝播することが相対性理論で予言され、2002年に観測により確認された。 光速,指光在真空中的速率,是一個物理常數,一般記作c,精確值為299792458m/s(有时会取为3.00×108 m/s)。這一數值之所以是精確值,是因為米的定義本身就是基於光速和國際時間標準的,任何对光速更精确的测定,都不会改变光速的精确值,相反地,将会使得人们对一米和一秒的定义更为精确。 根據狹義相對論,光速是宇宙中所有的物質運動、訊息傳播的速度上限,也是所有無質量粒子及對應的場波動在真空中運行的速度。這一速度獨立於射源運動以及觀測者所身處的慣性參考系。 La vitesse de la lumière dans le vide, habituellement notée c, est une constante physique de l'Univers qui est importante dans plusieurs domaines de la physique. L'étude de la lumière et de sa vitesse remonte à l'Antiquité. Des philosophes et des scientifiques, en s'appuyant sur des arguments théoriques ou des observations, affirment que sa vitesse est infinie, alors que d'autres prétendent que non. Ole Rømer démontre en 1676 qu'elle est finie. Les scientifiques s'attachent ensuite à déterminer sa valeur par divers moyens, la précision s'améliorant au fil des années. Dès la fin du XIXe siècle il est acquis qu'elle vaut environ 300 000 km/s ; en 1975, le résultat fiable le plus précis est 299 792 458 ± 1 m/s. En 1983, un accord international redéfinit le mètre de telle sorte que la vitesse
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497.0
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l
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1.3254192E8 0.307 498.00000000000006 1.02877776E8 3.3 1.0 Time 134 ms 1.3 3.15576E7 119 ms 173 7.8894E13
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August 2022
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Approximate values Exact values Approximate light signal travel times
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astronomical units per day across the Milky Way from Sun to Earth parsecs per year one metre the length of Earth's equator from geostationary orbit to Earth from the nearest star to Sun one foot from Moon to Earth dbr:Miles_per_hour from the Andromeda Galaxy to Earth dbr:Metre_per_second from the nearest galaxy to Earth Distance one light-year one parsec dbr:Kilometres_per_hour
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Speed of light
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-14
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dbo:abstract
빛의 속력(영어: speed of light) 또는 광속은 진공에서 299,792,458 m/s라는 정확한 값이며, 국제적으로 라고 표기한다. 빛의 속력은 기본 물리 상수로, 길이 단위인 미터는 이것으로부터 정의되었다. 특수 상대성 이론에 따르면, c는 우주의 모든 에너지, 물질, 정보가 가질 수 있는 속도의 최댓값이며, 최근 이론에 따르면 중력파의 속력이기도 하다. 질량이 없는 입자와 장(場; 빛과 같은 전자기 복사를 포함한다)은 c로 진행하며, 관성계에서는 관찰자의 속도와 관계없이 입자와 파동은 c로 진행한다. 상대성 이론에 따르면, c는 시간과 공간을 연관시키며, 질량-에너지 등식 E=mc²에도 등장한다. 특수 상대성 이론에 따르면 모든 움직임, 즉 물질의 이동 속도는 물론, 질량을 가진 게이지 보손도 빛의 속력보다 더 빨리 움직일 수 없다. 오직 불변 질량이 0인 물체(예를 들면 광자)만이 빛의 속력으로 전파될 수 있다. Unter der Lichtgeschwindigkeit ( nach lat. celeritas: Schnelligkeit) versteht man meist die Ausbreitungsgeschwindigkeit von Licht im Vakuum. Neben Licht breiten sich auch alle anderen elektromagnetischen Wellen sowie auch Gravitationswellen mit dieser Geschwindigkeit aus. Sie ist eine fundamentale Naturkonstante, deren Bedeutung in der speziellen und allgemeinen Relativitätstheorie weit über die Beschreibung der elektromagnetischen Wellenausbreitung hinausgeht. Die Längeneinheit Meter ist über die Lichtgeschwindigkeit im Vakuum definiert. Der Wert der Lichtgeschwindigkeit wurde hierfür auf exakt 299792458 m/s festgelegt. In einem materiellen Medium wie Luft oder Glas ist die Ausbreitungsgeschwindigkeit des Lichts kleiner. Wenn es sich nicht aus dem Zusammenhang ergibt, wird durch Wortzusätze deutlich gemacht, ob die Lichtgeschwindigkeit im Vakuum oder im Material gemeint ist. In beiden Fällen verwendet man das Formelzeichen ; gelegentlich wird der Index Null für die Lichtgeschwindigkeit im Vakuum verwendet. Nach den Maxwellschen Gleichungen der Elektrodynamik hängt die Lichtgeschwindigkeit nicht von der Geschwindigkeit der Lichtquelle ab. Aus dieser Feststellung zusammen mit dem Relativitätsprinzip folgt, dass die Lichtgeschwindigkeit auch nicht vom Bewegungszustand des zu ihrer Messung verwendeten Empfängers abhängt. Daraus entwickelte Albert Einstein die Relativitätstheorie. Sie besagt unter anderem, dass die Vakuumlichtgeschwindigkeit eine unüberwindliche Geschwindigkeitsgrenze für die Bewegung von Masse und für die Übertragung von Energie und Information im Universum darstellt. Teilchen ohne Masse, wie die Photonen, bewegen sich stets mit dieser Grenzgeschwindigkeit, alle massebehafteten Teilchen stets langsamer. Als Folge der speziellen Relativitätstheorie (SRT) verbindet die Naturkonstante die vorher unabhängigen Konzepte Energie und Masse in der Äquivalenz von Masse und Energie . Ort und Zeit werden durch zur Raumzeit zusammengefasst und durch den Vierervektor in einem vierdimensionalen Raum beschrieben. 光速(こうそく、(英: speed of light)、あるいは光速度(こうそくど)とは、光が伝播する速さのことである。真空中における光速の値は 299792458 m/s(約30万 km/s)と定義されている。この速度においては、太陽から地球まで約8分19秒、月から地球まで2秒もかからない。俗に「1秒間に地球を7周半回ることができる速さ」とも表現される。 以下で単に「光速」と言うとき、真空中の光速を指して使うことがある。 光速は宇宙における最大速度であり、物理学において時間と空間の基準となる特別な意味を持つ値でもある。 現代の国際単位系では長さの単位メートルは光速と秒により定義されている。光速度は電磁波の伝播速度でもあり、マクスウェルの方程式で媒質を真空にすると光速が一定となるということが相対性理論の根本原理の由来になっている。 重力作用も光速で伝播することが相対性理論で予言され、2002年に観測により確認された。 Ско́рость све́та в вакууме — абсолютная величина скорости распространения электромагнитных волн, в точности равная 299 792 458 м/с (или приблизительно 3×108 м/с). В физике традиционно обозначается латинской буквой «» (произносится как «цэ»), от лат. celeritas (скорость). Скорость света в вакууме — фундаментальная постоянная, не зависящая от выбора инерциальной системы отсчёта (ИСО). Она относится к фундаментальным физическим постоянным, которые характеризуют не просто отдельные тела или поля, а свойства геометрии пространства-времени в целом. Из постулата причинности (любое событие может оказывать влияние только на события, происходящие позже него, и не может оказывать влияние на события, произошедшие раньше него) и постулата специальной теории относительности о независимости скорости света в вакууме от выбора инерциальной системы отсчёта (скорость света в вакууме одинакова во всех системах координат, движущихся прямолинейно и равномерно друг относительно друга) следует, что скорость любого сигнала и элементарной частицы не может превышать скорость света. Таким образом, скорость света в вакууме — предельная скорость движения частиц и распространения взаимодействий. Argiaren abiadura definitzeko, argia hutsean hedatzen denean daraman abiaduratik hasi beharra dago eta, hortik aurrera, argiaren abiadura definitu. Argia hutsean hedatzen denean, haren abiadura bat da, 299.792.458 ko balioa duena eta ikurraren bidez adierazten dena. Hutsa ez den ingurune batean, ordea, argiaren abiadura hutseko abiadura baino txikiagoa da, eta zenbait ezaugarriren menpekoa da, besteak beste, , eta beste ezaugarri magnetiko batzuen menpekoa. Prędkość światła w zależności od kontekstu może oznaczać: * prędkość fali elektromagnetycznej w próżni i wynikającą z tego stałą fizyczną (c = 299 792 458 m/s), * prędkość światła w ośrodkach materialnych. De lichtsnelheid is de snelheid waarmee het licht en andere elektromagnetische straling zich voortplanten. In vacuüm heeft de lichtsnelheid (in SI-eenheden) voor alle frequenties de waarde c = 299 792 458 m/s. La velocidad de la luz en el vacío es una constante universal con el valor de 299 792 458 m/s,​​aunque suele aproximarse a 3·108 m/s. Se simboliza con la letra c, proveniente del latín celéritās (en español, celeridad o rapidez). El valor de la velocidad de la luz en el vacío fue incluido oficialmente en el Sistema Internacional de Unidades como constante el 21 de octubre de 1983,​ pasando así el metro a ser una unidad derivada de esta constante. También se emplea en la definición del año luz, unidad de longitud equivalente a 9,46·1015 m, ya que la velocidad de la luz también se puede expresar como 9,46·1015 m/año. La rapidez a través de un medio que no sea el "vacío" depende de su permitividad eléctrica, de su permeabilidad magnética, y otras características electromagnéticas. En medios materiales, esta velocidad es inferior a c y queda codificada en el índice de refracción. En modificaciones del vacío más sutiles, como espacios curvos, efecto Casimir, poblaciones térmicas o presencia de campos externos, la velocidad de la luz depende de la densidad de energía de ese vacío.​ Rychlost světla (nebo jiného elektromagnetického záření) ve vakuu (stručně též „světelná rychlost“ bez nutnosti uvádět ještě „ve vakuu“) je definována jako fázová rychlost postupného elektromagnetického vlnění ve vakuu. V soustavách jednotek založených na metrickém systému (tedy i SI) má vzhledem k definici metru přesnou hodnotu 299 792 458 metrů za sekundu (1 079 252 848,8 km/h). Označuje se podle uvedené normy ISO/IEC značkou , často však jen písmenem c, které norma ponechává pro rychlost světla v látkovém prostředí (značka je pravděpodobně odvozena z latinského celeritas, což znamená rychlost, nebo z constans, znamenající konstanta). Tato rychlost dává přirozený poměr měřítek prostoru a času a je nejvyšší možnou rychlostí šíření signálu či informace.(Pokud nebereme v potaz kvantové provázání) Rychlost světla v látkovém prostředí je v mikroskopickém popisu stejná jako rychlost světla ve vakuu , avšak světlo kvantově interaguje s částicemi látky, a proto se v makroskopickém popisu jeví jeho fázová rychlost pomalejší. Rychlost šíření světla je pak rovna , kde je index lomu příslušné látky (materiálu). Tairiseach fisiciúil é luas an tsolais san fholús, agus é tábhachtach ina lán brainsí eolaíochta. Is é an tsiombail a sheasann dó sna foirmlí matamaitice ná c, agus is ionann é agus 299,792,458 méadar in aghaidh an tsoicind. Is luach cruinn é seo, nó is de réir na huimhreach seo a shainítear an méadar mar aonad faid. Швидкість світла — фізичний термін, який використовують у двох, пов'язаних між собою, однак концептуально різних значеннях. Насамперед, швидкість світла — фундаментальна фізична стала, швидкість розповсюдження електромагнітної взаємодії у вакуумі. Інше значення — швидкість розповсюдження електромагнітних хвиль, включно зі світлом, у певному середовищі. La velocitat de la llum en el buit, comunament representada amb la lletra c, és una constant física universal important en molts camps de la física. El seu valor és exactament 299 792 458 metres per segon, un valor exacte perquè la longitud del metre es defineix a partir d'aquesta constant i la definició estàndard internacional de segon. D'acord amb la relativitat especial, c és la velocitat màxima a la qual pot viatjar tota l'energia, la matèria i la informació de l'univers. És la velocitat a la qual totes les i els seus camps associats (inclosa la radiació electromagnètica, com la llum) viatgen en el buit. És també la (és a dir, de les ones gravitatòries) predita per les teories actuals. Aquestes partícules i ones viatgen a c, independentment del moviment de la font o el sistema de referència inercial de l'observador. En la teoria de la relativitat, c interrelaciona l'espai i el temps, i també apareix en la famosa equació d'equivalència massa-energia, E = mc². La velocitat a la qual la llum es propaga a través de materials transparents, com el vidre o l'aire, és menor que c. La relació entre c i la velocitat v a la qual viatja la llum a través d'un material s'anomena l'índex de refracció n del material (n = c / v). Per exemple, l'índex de refracció del vidre per la llum visible és típicament d'aproximadament 1,5, cosa que significa que la llum en el vidre viatja a c / 1,5 ≈ 200 000 km/s; l'índex de refracció de l'aire per la llum visible és d'1,000 293, de manera que la velocitat de la llum en l'aire és de 299 705 km/s (prop de 88 km/s més lenta que c). 光速,指光在真空中的速率,是一個物理常數,一般記作c,精確值為299792458m/s(有时会取为3.00×108 m/s)。這一數值之所以是精確值,是因為米的定義本身就是基於光速和國際時間標準的,任何对光速更精确的测定,都不会改变光速的精确值,相反地,将会使得人们对一米和一秒的定义更为精确。 根據狹義相對論,光速是宇宙中所有的物質運動、訊息傳播的速度上限,也是所有無質量粒子及對應的場波動在真空中運行的速度。這一速度獨立於射源運動以及觀測者所身處的慣性參考系。 Ljusets hastighet (betecknas c) är egentligen två olika hastigheter: 1. * den högsta möjliga hastigheten för informationsöverföring enligt relativitetsteorin, en grundläggande egenskap hos rumtiden. 2. * hastigheten för elektromagnetisk strålning, baseras på elektriska och magnetiska egenskaper hos ett medium. I vakuum är de lika stora. I andra medier utbreder sig strålningen långsammare. Ljusets hastighet i vakuum, c, är en fysikalisk konstant och är 299 792 458 m/s (exakt värde). Denna hastighet är oberoende av observatörens rörelse – två olika observatörer kommer alltid att uppmäta samma hastighet, oavsett hur de rör sig i förhållande till varandra. Som en mera åskådlig föreställning om ljushastighetens värde kan nämnas att hastigheten motsvarar sträckan jorden runt sju och en halv gång på en sekund. Laju cahaya atau kecepatan cahaya disimbolkan dengan c adalah sebuah konstanta fisika universal yang penting dalam banyak bidang fisika. Nilai presisinya adalah 299.792.458 meter per detik (kira-kira 3,00×108 m/s), karena panjang meter didefinisikan berdasarkan konstanta ini dan standar internasional waktu. Kelajuan ini merupakan kelajuan maksimum yang dapat dilajui oleh segala bentuk energi, materi, dan informasi dalam alam semesta. Kelajuan ini merupakan kelajuan segala partikel tak bermassa dan medan fisika, termasuk radiasi elektromagnetik dalam vakum. Kelajuan ini pula menurut teori modern adalah kelajuan gravitasi (kelajuan dari gelombang gravitasi). Partikel-partikel maupun gelombang-gelombang ini bergerak pada kelajuan c tanpa tergantung pada sumber gerak maupun kerangka acuan inersial pengamat. Dalam teori relativitas, c saling berkaitan dengan ruang waktu. Konstanta ini muncul pula pada persamaan fisika kesetaraan massa-energi E = mc2. Kelajuan cahaya yang merambat melalui seperti gelas ataupun udara lebih lambat dari c. Rasio antara c dengan kelajuan v (kelajuan rambat cahaya dalam suatu materi) disebut sebagai indeks bias n material tersebut (n = c / v). Sebagai contohnya, indeks refraksi gelas umumnya berkisar sekitar 1,5, berarti bahwa cahaya dalam gelas bergerak pada kelajuan c / 1,5 ≈ 200.000 km/s; indeks refraksi udara untuk cahaya tampak adalah sekitar 1,0003, sehingga kelajuan cahaya dalam udara adalah sekitar 299.700 km/s (sekitar 90 km/s lebih lambat daripada c). Untuk berbagai tujuan praktis, cahaya dan gelombang elektromagnetik lainnya akan tampak untuk menyebar secara seketika, tetapi untuk jarak jauh dan pengukuran yang sangat sensitif, kelajuan terbatasnya memiliki efek yang nyata. Hal inilah yang menimbulkan dilatasi waktu dalam pengamatan. Seperti dalam berkomunikasi dengan wahana antariksa yang jauh, dapat dibutuhkan bermenit-menit sampai berjam-jam agar pesan dari Bumi dapat mencapai pesawat ruang angkasa, atau sebaliknya. Cahaya yang dilihat dari bintang, galaksi dan benda - benda angkasa meninggalkan sumbernya tersebut bertahun-tahun yang lalu, bahkan untuk benda terjauh yang dapat kita lihat dalam alam semesta teramati, apa yang kita lihat di bumi sekarang adalah apa yang terjadi saat ledakan dahsyat terjadi (13,8 miliar tahun yang lalu). Hal ini yang memungkinkan studi tentang sejarah alam semesta dengan melihat objek yang jauh. Kelajuan terbatas cahaya juga membatasi kecepatan maksimum teoretis komputer, karena informasi harus dikirim dalam komputer dari chip ke chip. Kecepatan cahaya dapat digunakan dengan pengukuran waktu terbang untuk mengukur jarak besar dengan presisi tinggi. Ole Rømer pertama menunjukkan pada 1676 bahwa cahaya berjalan pada kecepatan yang terbatas (bukannya seketika) dengan mempelajari gerakan yang tampak dari bulan Jupiter Io. Pada tahun 1865, James Clerk Maxwell mengusulkan bahwa cahaya adalah gelombang elektromagnetik, dan karena itu bergerak dengan kecepatan c yang muncul dalam teori elektromagnetismenya. Pada tahun 1905, Albert Einstein mendalilkan bahwa laju cahaya sehubungan dengan kerangka inersia independen dari gerakan sumber cahaya, dan menjelajahi konsekuensi postulat dengan menurunkan teori relativitas khusus dan menunjukkan bahwa parameter c memiliki relevansi di luar konteks cahaya dan elektromagnetisme. Setelah berabad-abad pengukuran semakin tepat, pada tahun 1975 kecepatan cahaya diketahui sebagai 299.792.458 m/s dengan ketidakpastian pengukuran 4 bagian per miliar. Pada tahun 1983, meter didefinisikan kembali dalam Sistem Satuan Internasional (SI) sebagai jarak yang ditempuh oleh cahaya dalam ruang hampa di 1/299.792.458 detik. Akibatnya, nilai numerik dari c dalam meter per detik sekarang tetap persis dengan definisi meter. Lumrapido, kies kutima simbolo estas c (kaj ankaŭ c0), estas baza fizika konstanto. Ĝi estas la rapido de lumo kaj de ĉiu speco de elektromagneta radiado en vakuo, la rapido de senmasaj partikloj kaj la maksimuma ebla rapido de transportiĝo de energio kaj de informo. Ĝi egalas ekzakte al 299 792 458 metroj en sekundo. Ofte oni citas la proksimuman valoron 300 000 kilometroj en sekundo. En speciala relativeco, c kunigas spacon kaj tempon en spactempon, kaj ĝi aperas en la fama ekvacio, kiu egalvalorigas mason kaj energion E = mc2. En ĉiu inercia referenckadro, sendepende de relativaj rapidoj de la elsendanto kaj la observanto, c estas la rapido de ĉiu senmasa partiklo kaj de fizika kampo ligita al tia, inkluzive de ĉia elektromagneta radiado en vakua spaco. La teorio antaŭdiras ke ĝi estas ankaŭ la rapido de gravito kaj de gravitaj ondoj. Ĝi estas la maksimuma limo de rapido por moviĝo de energio, materio kaj informo, ĉar superi ĝin "signifus detruon de la esenca rilato inter kaŭzo kaj efiko." Tio, ke lumrapido ne estas senlima, limigas ankaŭ la funkcian rapidecon de elektronikaj aparatoj. La rapido de lumo pasanta en travidebla substanco, ekzemple vitro aŭ aero, estas malpli ol c. La kvociento de c per la rapido v de lumo en la trairata substanco estas nomata la refrakta indico n de la substanco (n = c / v). Ekzemple, por videbla lumo tipa refrakta indico de vitro estas ĉirkaŭ 1.5, kaj lumo en vitro do pasas je c / 1.5 ≈ 200 000 km/s. La refrakta indico de aero por videbla lumo estas ĉirkaŭ 1.0003, kaj la lumrapido en aero nur malmulte diferencas de c. Tre longe dum la homa historio oni ne sciis, ĉu lumo atingas sian celon tuj, ĉu nur rapidege. La unua, kiu demonstris ke lumrapido ne estas senlima, estis Ole Rømer en la 17-a jarcento. Li pruvis la finiecon per studoj pri la ŝajna moviĝado de Io, luno de Jupitero. Post mezuradoj dum jarcentoj, ĉiam pli kaj pli precizaj, en 1975 eblis diri, ke la lumrapido egalas al 299 792 458 m/s kun relativa mezureraro je 4 miliardonoj. En 1983 oni redifinis metron per la lumrapido kaj tiel fiksis ankaŭ la ekzaktan valoron de c esprimitan per metroj en sekundo. Η ταχύτητα του φωτός είναι η ταχύτητα με την οποία το φως διαδίδεται στο κενό ή σε άλλα μέσα. Η ταχύτητα του φωτός στο κενό που συμβολίζεται συνήθως με c, είναι 299.792.458 m/s (μέτρα το δευτερόλεπτο) σε μονάδες SI, δηλαδή κατά προσέγγιση 300.000 χιλιόμετρα το δευτερόλεπτο ή σε επιστημονική μορφή 3·108m/s. Η ταχύτητα του φωτός στο «κενό» θεωρείται η μέγιστη ταχύτητα που μπορεί να αναπτυχθεί, όχι μόνο από το φως αλλά και από τα υπόλοιπα ηλεκτρομαγνητικά κύματα, άλλες μορφές μετάδοσης ενέργειας και από σωματίδια χωρίς μάζα. Η ταχύτητα αυτή είναι τόσο μεγάλη, ώστε αν ένας παρατηρητής κινούταν γύρω από τον ισημερινό της γης με αυτή την ταχύτητα θα ολοκλήρωνε το γύρω του κόσμου σε 13 εκατοστά του δευτερολέπτου. Άλλο παράδειγμα είναι ότι το φως του ήλιου φτάνει στη γη μετά από 8 λεπτά και 20 δευτερόλεπτα, αφότου εκπεμφθεί από την επιφάνειά του. Η ταχύτητα του φωτός δεν είναι σταθερή, αλλά εξαρτάται από το μέσο μέσα στο οποίο γίνεται η διάδοση. Συγκεκριμένα, όταν το φως διαδίδεται σε κάποιο υλικό (όπως το γυαλί ή ο αέρας), η ταχύτητά του εξαρτάται από τον δείκτη διάθλασης του συγκεκριμένου υλικού· όσο μεγαλύτερος είναι ο δείκτης διάθλασης, τόσο πιο μικρή είναι η ταχύτητα του φωτός μέσα στο υλικό. Η ταχύτητα του φωτός σε άλλα υλικά είναι κατά κανόνα μικρότερη από την ταχύτητα του φωτός στο κενό, ο δείκτης διάθλασης του κενού είναι 1 και στα υπόλοιπα υλικά μεγαλύτερος του ένα. Λόγω της αλλαγής της ταχύτητάς του καθώς μεταβαίνει από ένα μέσο σε άλλο με διαφορετικό δείκτη διάθλασης παρατηρείται το φαινόμενο της διάθλασης, γιατί ισχύει ο νόμος της συντομότερης διαδρομής του φωτός. The speed of light in vacuum, commonly denoted c, is a universal physical constant that is important in many areas of physics. The speed of light c is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour). According to the special theory of relativity, c is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space. All forms of electromagnetic radiation, including visible light, travel at the speed of light. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects. Starlight viewed on Earth left the stars many years ago, allowing humans to study the history of the universe by viewing distant objects. When communicating with distant space probes, it can take minutes to hours for signals to travel from Earth to the spacecraft and vice versa. In computing, the speed of light fixes the ultimate minimum communication delay between computers, to computer memory, and within a CPU. The speed of light can be used in time of flight measurements to measure large distances to extremely high precision. Ole Rømer first demonstrated in 1676 that light travels at a finite speed (non-instantaneously) by studying the apparent motion of Jupiter's moon Io. Progressively more accurate measurements of its speed came over the following centuries. In a paper published in 1865, James Clerk Maxwell proposed that light was an electromagnetic wave and, therefore, travelled at speed c. In 1905, Albert Einstein postulated that the speed of light c with respect to any inertial frame of reference is a constant and is independent of the motion of the light source. He explored the consequences of that postulate by deriving the theory of relativity and, in doing so, showed that the parameter c had relevance outside of the context of light and electromagnetism. Massless particles and field perturbations, such as gravitational waves, also travel at speed c in a vacuum. Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. Particles with nonzero rest mass can be accelerated to approach c but can never reach it, regardless of the frame of reference in which their speed is measured. In the special and general theories of relativity, c interrelates space and time and also appears in the famous equation of mass–energy equivalence, E = mc2. In some cases, objects or waves may appear to travel (e.g., phase velocities of waves, the appearance of certain high-speed astronomical objects, and particular quantum effects). The expansion of the universe is understood to exceed the speed of light beyond a certain boundary. The speed at which light propagates through transparent materials, such as glass or air, is less than c; similarly, the speed of electromagnetic waves in wire cables is slower than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c/v). For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c/1.5 ≈ 200000 km/s (124000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c. سرعة الضوء في الفراغ هي ثابت فيزيائي هام في العديد من مجالات الفيزياء، يرمز له في العادة بالرمز c وتساوي قيمته 299,792,458 متر لكل ثانية. تستخدم سرعة الضوء حاليا لتعريف وحدة المتر باعتبارها ثابتا فيزيائيا ومعيارا دوليا لقياس الوقت. وهو ما يعادل بعد التقريب لثلاثة أرقام معنوية 300,000 كيلومتر في الثانية أو حوالي مليار كيلومتر لكل ساعة. بموجب النسبية الخاصة، سرعة الضوء (أو الثابت c) هي أقصى سرعة تستطيع أن تسافر بها كل أشكال الطاقة، أو المادة، أو المعلومات في الفضاء. وهي سرعة سفر ومجالاتها المتلازمة (بما في ذلك الإشعاع الكهرومغناطيسي مثل الضوء) عبر الفراغ. وهي أيضا سرعة الجاذبية (الخاصة بأمواج الجاذبية) التي تنبأت بها النظريات الحالية. وتسافر تلك الجسيمات والأمواج بالسرعة c أيا كانت سرعة المصدر والإطار المرجعي العطالي للمراقب. في نظرية النسبية، الثابت c يرابط بين المكان والزمان، ويظهر أيضا في المعادلة الشهيرة لتكافؤ المادة والطاقة E = mc2. ينتشر الضوء في المواد الشفافة مثل الزجاج والهواء بسرعة أقل من c. تدعى النسبة بين c وبين سرعة الضوء في مادة ما v بقرينة الانكسار n لتلك المادة (n=c/v). مثال، تساوي عادة قرينة انكسار الضوء المرئي عند مروره عبر الزجاج حوالي 1.5، معنى ذلك أن الضوء يسير في الزجاج بسرعة v = c/1.5 ≈ 200,000 km/s، وللهواء تساوي قرينة الانكسار 1.0003، وبالتالي تقل سرعة الضوء المرئي في الهواء بحوالي 90 كم/ث عن c. يظهر انتشار الضوء وغيره من الموجات الكهرومغناطيسية في كثير من الأصداء العملية بشكل آني (أو لحظي)، ولكن للمسافات الطويلة والقياسات الحساسة جدا، فإن السرعات المحدودة لتلك الموجات تكون لها تأثيرات ملحوظة. الاتصال بمسابير الفضاء البعيدة، على سبيل المثال، يمكن أن يستغرق دقائق لساعات وذلك لإيصال رسالة من الأرض إلى المركبة الفضائية، أو العكس. كما أن الضوء الذي يصلنا من النجوم يكون قد رحل عنها منذ سنوات عديدة (آلاف السنين الضوئية)، فالذي يصلنا هو صورة تلك النجوم في زمن سحيق وهو ما يسمح بدراسة تاريخ الكون من خلال النظر في مكوناته البعيدة. كما أن سرعة الضوء المحدود تضع حداً للسرعة القصوى النظرية لأجهزة الحاسب الآلي، حيث تنتقل المعلومات داخل الحاسوب من رقاقة لأخرى. وبما أن سرعة الضوء ثابتة في الأوساط المختلفة يمكن استخدامها مع زمن الطيران لقياس مسافات كبيرة بدقة عالية. من المعروف أنه لا يوجد شيء أسرع من الضوء ولكن في السنوات الماضية تم إجراء عدة تجارب لاكتشاف ما هو أسرع وقد وجدوا أن الإلكترونات المتجاورة تدور في اتجاهات مخالفة أي أن إلكتروني المستوى الأول أحدهما يدور في إتجاه عقارب الساعة والآخر في عكس إتجاه عقارب الساعة ولو تم عكس اتجاه أحدهما فيتم عكس التالي مباشرة وفي نفس اللحظة حتى إن كان أحدهما على كوكب الأرض والآخر خارج المجرة. La vitesse de la lumière dans le vide, habituellement notée c, est une constante physique de l'Univers qui est importante dans plusieurs domaines de la physique. L'étude de la lumière et de sa vitesse remonte à l'Antiquité. Des philosophes et des scientifiques, en s'appuyant sur des arguments théoriques ou des observations, affirment que sa vitesse est infinie, alors que d'autres prétendent que non. Ole Rømer démontre en 1676 qu'elle est finie. Les scientifiques s'attachent ensuite à déterminer sa valeur par divers moyens, la précision s'améliorant au fil des années. Dès la fin du XIXe siècle il est acquis qu'elle vaut environ 300 000 km/s ; en 1975, le résultat fiable le plus précis est 299 792 458 ± 1 m/s. En 1983, un accord international redéfinit le mètre de telle sorte que la vitesse de la lumière est d'exactement 299 792 458 m/s. Dans la vie de tous les jours, la lumière (et donc les ondes électromagnétiques) semble se déplacer instantanément, mais sur de longues distances ou dans des instruments de mesure très précis, des effets permettent de déduire que sa vitesse est finie.Dans les matériaux transparents et les conducteurs électriques, les ondes électromagnétiques se déplacent plus lentement que c.Les vitesses de certains phénomènes ondulatoires et de certains objets célestes peuvent être plus grandes que c.La vitesse d'expansion de l'Univers excède c hors de certaines limites géométriques. Bien que cette vitesse soit le plus souvent associée à la lumière, c'est aussi celle de toute particule sans masse et de toute perturbation dans un champ situé dans le vide, incluant les ondes gravitationnelles et les ondes électromagnétiques (dont la lumière visible ne constitue qu'une minuscule partie).Les particules dotées d'une masse au repos peuvent approcher de c, mais ne peuvent l'atteindre, peu importe le référentiel inertiel dans lequel leur vitesse est mesurée. In fisica la velocità della luce è la velocità di propagazione di un'onda elettromagnetica e di una particella libera senza massa. Nel vuoto ha un valore di 299792458 m/s. Viene indicata normalmente con la lettera c (dal latino celeritas), scelta fatta per primo da Paul Drude nel 1894. Secondo la relatività ristretta, la velocità della luce nel vuoto, , è una costante fisica universale indipendente dal sistema di riferimento utilizzato e la velocità massima a cui può viaggiare qualsiasi informazione nell'universo, unendo le grandezze fisiche classiche di spazio e tempo nell'unica entità dello spaziotempo e rappresentando la grandezza di conversione nell'equazione di equivalenza massa-energia. Nella relatività generale è la velocità prevista per le onde gravitazionali. Dal 21 ottobre 1983 si considera il valore come esatto, ovvero senza errore, e a partire da esso si definisce la lunghezza del metro nel Sistema Internazionale. A velocidade da luz no vácuo, simbolizada pela letra c, é, por definição, igual a 299 792 458 metros por segundo. O símbolo c origina-se do latim celeritas, que significa velocidade ou rapidez. A velocidade da luz em um meio material transparente, tal como o vidro ou o ar, é menor que c, sendo a fração função do índice de refração do meio.
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