What is velocity of light in vacuum ?
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In vacuum, the phase velocity is c = 299 792 458 m/s, independent of the optical frequency, and equals the group velocity. ... In the X-ray region, refractive indices are slightly below 1, corresponding to phase velocities slightly above the vacuum velocity of light.
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The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second.
Astronomical units per day: 173
Miles per second: 186000
Metres per second: 299792458
Miles per hour: 671000000
Kilometres per hour: 1080000000
Parsecs per year: 0.307
From Sun to Earth (1 AU): 8.3 min
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