| Symbol | λ |
|---|---|
| SI unit | Meter (m) |
| Describes | Spatial periodicity |
Definition and context
Wavelength describes a spatial repetition. In a simple periodic wave, we can measure it between two consecutive crests or between any other two equivalent points in the pattern. It is expressed in units of length, usually meters.
It is different to ask how long it takes for the motion to repeat at a point and how much space one repetition occupies at an instant. The first question leads to the period; the second, to the wavelength. If a drawing does not include a spatial scale, it does not allow us to assign an actual distance, even if the crests are clearly visible. For a periodic wave, v = f × λ, provided we identify which velocity and which conditions of the medium we are using.
What we know and its limits
Introductory reference sheet. Properties and applications depend on measurement conditions; consult the sources before making comparisons.
Follow the evidence
The original sources for exploring this explanation and its limits.
- University Physics Volume 1 · Mathematics of Waves
OpenStax · Rice University
Amplitude, wavelength, frequency, and speed.
Image credits
SciClue · AI-generated illustration (OpenAI) · Original source · Recurso editorial de SciClue · generado con IA