Question

what is speed of light in physics

Answer 1

speed of light in vacuum is 299,758,492 m/s but for our convenience we take it as 3×10^8 m/s. it is the fastest known thing in the universe
hope this helps

Answer 2

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