Value Of c

The speed of light is defined as the speed with which a light photon travels in the vacuum. It is denoted by the alphabet c and measured using SI unit m/s. The value of velocity of light or value of c is a constant at any part of the universe. This physical constant has multiple applications at various disciplines of physics.

Speed of Light

The velocity of the light in the vacuum or air:

The speed of light c = 299792458 m/s ≅ 3 × 10⁸ m/s.

The velocity of light can be expressed in terms of mph or km/s. That is-

• The speed of light in mph 186,000 miles per hour.
• The speed of light in air is 299792 km/s.