velocity of light

Definitions

General Science

Astronomy

  • In a vacuum, light moves at almost 300,000km a second, as does all other electromagnetic radiation. This is much more than a mere measure of distance covered in a given amount of time because c, the velocity of light, appears in the fundamental equations of relativity as the factor linking mass with the amount of energy to which it is equivalent, and as a basic speed limit for all objects in the universe.

Electronics

  • The speed of light in a given direction.
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