Question

define speed of light ​

Answer 1

Speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. Speed of light. Quick Facts.

Answer 2

$\underline \mathtt \color{magenta}what \: is \: speed \: of \: light$

Speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second.

Ole Roemer discovered the speed of light