What Is Speed Of Light
The speed of light in free space that is in a vacuum is a constant that has been measured to considerable accuracy.
What is speed of light. In miles per hour light speed is well a lot. 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 299 792 458 metres per second approximately 300 000 km s or 186 000 mi s 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. Speed of light speed at which light waves propagate through different materials. In a vacuum the speed of light is 299 792 458 meters per second.
This is the speed with which all electromagnetic field s including radio waves infrared ir ultraviolet uv x. To nine significant figures it is 299 792 458 meters per second 2 99792458 x 10 8 m s.