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Code of the Future - Speed of Light $2 2oz .999 pure silver coin, fluorescent effect, antique finish, high relief.
This is the second coin release in the "Code of the Future" series and is dedicated to the world of new technologies, new visions and ideas. This coin is taking us into a different dimension of reality with the best symbols of the future.
Mintage: only 500 pcs. With box and COA.
2 Item Items
Warning: Last items in stock!
|Face Value :||2 Dollars|
|Metal :||.999 Fine silver|
|Weight :||2 oz|
|Size :||50.00 mm|
|Quality :||Proof antique finish|
|Mintage :||Only 500 pcs. worldwide|
|Series :||Code of the Future|
|Certificate of Authenticity :||Yes|
|Original ETUI box/case :||Yes|
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second (approximately 3.00×108 m/s, approximately 186,282 mi/s); it is exact because the length of the metre is defined from this constant and the international standard for time. According to special relativity, c is the maximum speed at which all matter and hence information in the universe can travel. It is the speed at which all massless particles and changes of the associated fields (including light, a type of electromagnetic radiation, and gravitational waves) travel in vacuum. Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. In the theory of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.
The speed at which light propagates through transparent materials, such as glass or air, is less than c; similarly, the speed of radio 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 ≈ 200,000 kilometres (120,000 mi) /s; the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 299,700 kilometres (186,200 mi) /s (about 90 kilometres (56 mi) /s slower than c).
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