Profile
Settings
Refer your friends
Sign out
Answer: The speed of light in a vacuum, commonly represented by c, is a universal physical constant that is important in many areas of physics. Nothing can move as fast as the speed of light in a vacuum. Light always travels linearly at the same speed in a vacuum, and this constant speed is
c = 2.979942 58 × 108 ms-1.
Whenever the light is in a vacuum, its velocity has an accurate value, regardless of who decides it. Even if the vacuum is inside a rocket box flying away from the planet, the speed of light passing through that box is exactly c by both the rocket astronaut and the planet’s fictitious observer.
