| Common symbol | f |
|---|---|
| Unit | Hertz (Hz) |
| Relationship | f = 1/T |
Definition and context
Frequency indicates how many cycles of a periodic phenomenon occur per unit of time. Its unit is the hertz, equivalent to one repetition per second. It is related to the period: as the period increases, the frequency decreases.
In a hypothetical example, four complete oscillations per second correspond to 4 Hz. That figure does not tell us how far the system moves from its equilibrium position or how much energy it transports. For a periodic wave, knowing the frequency and wavelength lets us relate them to the phase velocity. Each quantity answers a different question, and keeping them distinct avoids confusing a faster oscillation with a wave that necessarily travels faster.
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. - Guide to the SI · Units and Prefixes
National Institute of Standards and Technology
Derived units, names, symbols, and prefixes.
Image credits
SciClue · AI-generated illustration (OpenAI) · Original source · Recurso editorial de SciClue · generado con IA