Question

The speed of light is around ________ in vacuum.

Answer 1

1. The speed of light is maximum in a vacuum i.e$3\times {10}^{8}m{s}^{-1}$.
2. The speed of light changes when it goes from one medium to another medium.

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