what is the speed of light
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Answer:
Miles per second: 186000
Miles per hour: 671000000
Metres per second: 299792458
Kilometres per hour: 1080000000
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The speed of light in vacuum, commonly denoted c, is a universal physical constantimportant in many areas of physics. Its exact value is defined as 299792458 metres per second(approximately 300000 km/s, or 186000 mi/s[Note 3]). It is exact because by international agreement a metre is defined as the length of the path travelled by light in vacuum during a time interval of 1⁄299792458second.[Note 4][3] According to special relativity, c is the upper limit for the speed at which conventional matter and information can travel. Though this speed is most commonly associated with light, it is also the speed at which all massless particles and fieldperturbations travel in vacuum, including electromagnetic radiation and gravitational waves. Such particles and waves travel at cregardless of the motion of the source or the inertial reference frame of the observer. Particles with nonzero rest mass can approach c, but can never actually reach it. In the special and general theories of relativity, cinterrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.[4]
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