Csnelheid

Csnelheid, usually written as c-snelheid in Dutch, refers to the speed of light in vacuum and is one of the most important constants in physics. The symbol c is used across disciplines to denote this invariant speed.

In modern physics, c is treated as a universal and invariant quantity, independent of the observer's motion. It serves as a fundamental bridge between space and time and appears in Maxwell's equations, special relativity, and general relativity. Definitional value: c is exactly 299,792,458 meters per second. Since 1983, the meter has been defined as the distance that light travels in vacuum in 1/299,792,458 of a second, which makes c exact by definition.

Historically, measurements of light's speed helped establish c's reality, with experiments by Fizeau and Michelson demonstrating its finite value. Modern techniques use laser interferometry and atomic clocks to reach high precision.

The constant has wide applications, including the synchronization of Global Positioning System satellites, fiber-optic communications, and calculations in particle physics. It also sets the upper bound for any signal or information in vacuum.

Common misconceptions include thinking c is the speed of a moving object; in fact, it is a fixed limit for signals in vacuum. No material object with mass can reach or exceed this speed. In Dutch contexts, c-snelheid is the standard term for the speed of light, a concept central to the understanding of relativity and modern physics.