Speed of light

Definition

The Speed of Light (or c) is the speed at which a photon (an "energy packet" of electromagnetic radiation) travels in a vacuum.

Values

The exact measurement for the speed of light is 299,792,458 meters per second, in the following values, the speed of light will use values based on the rounded 300,000,000 m/s.

Meters per second:

$c=3\times 10^8\mathrm{m}{\mathrm{s}}^{\mathrm{-}\mathrm{1}}$

Kilometers per second:

$c=3\times 10^5\mathrm{k}\mathrm{m}{\mathrm{s}}^{\mathrm{-}\mathrm{1}}$

Miles per second:

$c=1.9\times 10^5\mathrm{m}\mathrm{i}{\mathrm{s}}^{\mathrm{-}\mathrm{1}}$

See also

• The speed of light on Wikipedia