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.

Kalkulator Frekuensi Sinyal

Kalkulator frekuensi sinyal gratis. Konversi antara frekuensi (Hz), periode (s), dan panjang gelombang (m) untuk gelombang elektromagnetik apa pun.

Konversi antara frekuensi, periode, dan panjang gelombang.

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

Rumus

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

Sumber & Referensi

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

Penafian

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.

Terakhir ditinjau: 2026-06-01 oleh tim editorial Numio.

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