Question

What is the speed of light?

Answer 1

Speed of light

1. Speed of light or speed of light in vacuum is the rate of change of displacement of light.
2. It is a universal constant that is important in many fields of physics.
3. The exact value of the speed of light in vacuum is $299792458m{s}^{-1}$.
4. While doing calculations, it is often assumed to be $3\times {10}^{8}m{s}^{-1}$
5. Light is the fastest moving thing on earth.
6. All forms of electromagnetic radiations travel in the speed of light.

The speed of light is $3\times {10}^{8}m{s}^{-1}$.