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how to find velocity from speed of light. 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 1 299 792 458 second. G 1 1v2 c2 1 10990c2 c2 1 109902 70888 g 1 1 v 2 c 2 1 1 0990 c 2 c 2 1 1 0990 2 70888.
V c where. The following formula is used to calculate the speed or velocity of a wave. History at your fingertips.
They defined the meter as the distance light traveled in vacuum for 1299792458 of a second such that the speed of light in a vacuum is drum roll 299792458 ms or 299792458 kms.
Light will travel faster through medium A at a velocity equal to the speed of light divided by the refractive index. To measure the speed of light would require an external definition of what a meter is. Light will not achieve a speed higher than c or 299 x 108 ms. Moreover this is a cause of other phenomena like relativistic velocity addition time dilation and length contraction.