How do I convert frequency to wavelength?

Use λ = v / f, where v is the wave speed in the medium and f is the frequency. For electromagnetic waves in vacuum, v = c = 299 792 458 m/s. Example: at 2.4 GHz (WiFi), λ = 299 792 458 / 2.4×10⁹ ≈ 0.125 m = 12.5 cm.

What's the difference between electromagnetic and acoustic waves?

Electromagnetic waves (radio, microwave, light) travel through vacuum at c ≈ 3×10⁸ m/s. Acoustic waves (sound) need a material medium and travel ~343 m/s in air or ~1480 m/s in fresh water — about a million times slower. Using the wrong medium for a wave type will give a wavelength that's off by ~10⁶.

How is the period of a signal calculated?

Period T is the time for one full cycle: T = 1 / f. A 1 kHz tone has a period of 1 ms; a 100 MHz FM radio signal has a period of 10 ns.

Why is the speed of light in vacuum exact?

Since the 1983 redefinition of the metre, c is fixed by definition at exactly 299 792 458 m/s (CODATA). The metre is defined as the distance light travels in 1/299 792 458 second — making c a defined constant, not a measured one.

Calculadora de Frequência de Sinal

Calculadora gratuita de frequência de sinal. Converta entre frequência (Hz), período (s) e comprimento de onda (m) para qualquer onda eletromagnética.

Converta entre frequência, período e comprimento de onda.

v = f \cdot λ, T = \frac{1}{f}, λ = \frac{v}{f}

Fórmula

v = f \cdot λ, T = \frac{1}{f}, λ = \frac{v}{f}

Fontes e referências

CODATA Value: speed of light in vacuum (c = 299 792 458 m/s, exact)National Institute of Standards and Technology (NIST)
ITU-R Recommendation V.431 — Nomenclature of the frequency and wavelength bands used in telecommunicationsInternational Telecommunication Union (ITU)
Speed of sound — reference values for air and waterThe Engineering ToolBox

Aviso legal

Wavelength/frequency relations assume a non-dispersive, lossless medium. The 'vacuum' medium uses the exact CODATA value c = 299 792 458 m/s and applies to electromagnetic waves (radio, light). 'Air' (343 m/s at 20 °C) and 'water' (1480 m/s at 20 °C) use the speed of sound and apply only to acoustic (mechanical) waves. Real-world propagation depends on temperature, humidity, salinity, refractive index and frequency.

Última revisão: 2026-06-01 pela equipa editorial da Numio.

Calculadoras relacionadas

Calculadora de Fator de Potência

Calcule e corrija o fator de potência de uma instalação elétrica.

Calculadora de Condensador (Capacitor)

Calcule a capacitância em série e paralelo, energia armazenada e reactância.

Calculadora de Transformador

Calcule a tensão, corrente e relação de transformação de um transformador.

Calculadora de Potência Elétrica

Calcule a potência elétrica em circuitos DC e AC, monofásicos e trifásicos.