The velocity of a light wave is represented by the speed of light, which is a fundamental constant in physics. It is denoted by the letter c and has a value of approximately:

c = 299,792,458 meters per second (m/s)

This value is constant in a vacuum and is often rounded to 3 x 10⁸ m/s for ease of calculation.

Important points to note:

* Light travels at the same speed in a vacuum regardless of the frequency or wavelength of the light wave. This is a fundamental property of light.

* The speed of light can change when it travels through different mediums. This is because light interacts with the particles in the medium, slowing it down. However, the speed of light in a vacuum is considered the "true" speed of light.

Therefore, c represents the velocity of a light wave in a vacuum, and it is a constant value.