The speed of
light, that is, the speed of light waves spread [1]. Vacuum speed of
light is an important physical constants, symbols of c (from the
English in the constant, which means constant; or Latin in the
celeritas, meaning quick), c is not only visible light transmission
rate, but for all electromagnetic waves the propagation velocity in a
vacuum. Vacuum speed of light equal to 299,792,458 m / s
(1,079,252,848.8 km / h). [2] this rate is not a measurement, but
rather a definition. It is the calculation of the value of (299792500 ±
100) m / sec. International System of Units of the basic unit of m at
the October 21, 1983 date was defined as light in 1 / 299, 792,458
seconds transmission distance. The use of imperial units, the speed of
light is approximately 186,282.397 miles / sec, or 670,616,629.384
miles / hour, about 1 ft / ns. In any transparent or translucent media
(such as glass and water), will reduce the speed of light; c than the
light in a medium speed is the refractive index of this medium. Changes
in gravity can bend light the spread of the space, so that the same
light as the lens through the bend, the quality seems to bypass the
larger objects. Light bending phenomenon is called gravitational
lensing effect, according to the changing light outside the band of the
spectrum showed an irregular degree of luminous galaxies can be
calculated the age and distance. |
