velocity of light - tradução para grego
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velocity of light - tradução para grego

SPEED OF ELECTROMAGNETIC WAVES IN VACUUM
Velocity of light; The speed of light in vacuum; Light speed; Speed of Light; Speed Of Light; Light speed barrier; Lightspeed; Speed of light (c); Weber's constant; Percentage of the speed of light; 299792458; Speed-of-light; Light Speed; Speed of Liht; 299,792,458; Speed of electricity/light; Speed of light in a vacuum; The speed of light in a vacuum; Speed of radio; The speed of radio; Fundamental Speed; Speed of ligth; 299,792,458 metres per second; Electromagnetic wave speed; The speed of light; 186282; Luminal speed; Speed of massless particles; Planck speed; Planck velocity; Vacuum speed of light; Celerity constant; 299792458 metres per second; Light-speed; 299792458 m/s; 299792458 metres/second; 299792458 metres / second; Speed of causality; C (speed of light); C (physics); C (constant); Speed of light in vacuum; History of the speed of light; Mach 874,030
  • alt=The distance from the Sun to Earth is shown as 150 million kilometres, an approximate average. Sizes to scale.
  • Hendrik Lorentz (right) with Albert Einstein (1921)
  • alt=A light ray passes horizontally through a half-mirror and a rotating cog wheel, is reflected back by a mirror, passes through the cog wheel, and is reflected by the half-mirror into a monocular.
  • alt=A diagram of a planet's orbit around the Sun and of a moon's orbit around another planet. The shadow of the latter planet is shaded.
  • alt=Schematic of the working of a Michelson interferometer.
  • Measurement of the speed of light using the eclipse of Io by Jupiter
  • The [[Lorentz factor]] ''γ'' as a function of velocity. It starts at{{Nbsp}}1 and approaches infinity as ''v'' approaches ''c''.
  • One of the last and most accurate time of flight measurements, Michelson, Pease and Pearson's 1930–35 experiment used a rotating mirror and a one-mile (1.6 km) long vacuum chamber which the light beam traversed 10 times. It achieved accuracy of ±11 km/s.
  • alt=Three pairs of coordinate axes are depicted with the same origin A; in the green frame, the x axis is horizontal and the ct axis is vertical; in the red frame, the x′ axis is slightly skewed upwards, and the ct′ axis slightly skewed rightwards, relative to the green axes; in the blue frame, the x′′ axis is somewhat skewed downwards, and the ct′′ axis somewhat skewed leftwards, relative to the green axes. A point B on the green x axis, to the left of A, has zero ct, positive ct′, and negative ct′′.
  • alt=A star emits a light ray that hits the objective of a telescope. While the light travels down the telescope to its eyepiece, the telescope moves to the right. For the light to stay inside the telescope, the telescope must be tilted to the right, causing the distant source to appear at a different location to the right.
  • A beam of light is depicted travelling between the Earth and the Moon in the time it takes a light pulse to move between them: 1.255 seconds at their mean orbital (surface-to-surface) distance. The relative sizes and separation of the Earth–Moon system are shown to scale.
  • alt=A box with three waves in it; there are one and a half wavelength of the top wave, one of the middle one, and a half of the bottom one.

velocity of light         
ταχύτητα φωτός
traffic lights         
  • An animated GIF shows a traffic light in 3 phases.
  • Halifax]], [[Nova Scotia]], with specially shaped lights to assist people with colour blindness
  • An advanced stop line at traffic lights in Liverpool
  • An example of an LED traffic light in [[Australia]]
  • A typical lane control signal head
  • A diagram of a countdown timer in the US style
  • Montréal]], Canada
  • Traffic lights for public transport in the Netherlands and Belgium
  • [[California]] attempts to discourage [[red light running]] by posting the minimum fine.
  • A traffic light in [[Westbrook, Maine]], on State Route 25. Notice the red arrow to the left of the two green straight lights.
  • A traffic light in [[Jakarta]], [[Indonesia]] with its count-down timer. A [[pedestrian crossing]] is also shown.
  • The [[Shibuya Crossing]], Tokyo is a famous example of a [[pedestrian scramble]] with diagonal crossings.
  • Sumburgh]] airport's runway. The movable barrier closes when aircraft land or take off.
  • A staging diagram for a typical signalised T-junction
  • Traffic light animation (pedestrians, cyclists and traffic) in [[Ljubljana]], [[Slovenia]]
  • Traffic lights can have several additional lights for filter turns or bus lanes.
SIGNALLING DEVICE TO CONTROL COMPETING FLOWS OF TRAFFIC
Traffic signal; Traffic lights; Traffic signals; Stop light; Stoplight; R.C. Flagman; Traffic Light; Traffic Lights; Road signal; Traffic Light Signal; Automated Traffic Signals; Traffic signal system; Stop N Go Light; Traffic semaphore; Red light (traffic light); Stoplights; 🚥; 🚦; Raffic Light; Signal light; Traffic Signal; History of traffic light; Green man (symbol); Red man (symbol); Dummy light; Dummy lights; Red light running; Redlightrunning; Traffic lamp; First electric traffic light; Stop Lights; Amber light; Red traffic light; Stop Light
φωτεινοί σηματοδότες, φανάρια
ταχύτητα φωτός      
velocity of light

Definição

Velocity
·noun Quickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light.
II. Velocity ·noun Rate of motion; the relation of motion to time, measured by the number of units of space passed over by a moving body or point in a unit of time, usually the number of feet passed over in a second. ·see the Note under Speed.

Wikipédia

Speed of light

The speed of light in vacuum, commonly denoted c, is a universal physical constant that 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 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 faster than light (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/1.5200000 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.