How are wavelength and frequency related?

Inversely proportional: c = lambda times f, where c = speed of light (299,792,458 m/s). Higher frequency equals shorter wavelength. A 100 MHz radio wave has lambda = 3 m; a 10 GHz microwave has lambda = 3 cm.

Is 5G radio or microwave?

5G uses both sub-6 GHz (lambda about 10-5 cm, microwave band) and mmWave (24-40 GHz, lambda about 12.5-7.5 mm). Higher frequency means more bandwidth but shorter range.

Sunlight is white (mixed wavelengths). Blue light (lambda about 450 nm) scatters more in atmosphere than red (lambda about 650 nm) - called Rayleigh scattering. At sunset, light travels through more air and blue scatters away, leaving red.

🌊 Wavelength ↔ Frequency Converter

Radio waves, visible light, X-rays — all EM waves at speed of light. Frequency and wavelength are inverse: c = f × λ. Spans ELF radio to gamma rays.

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Last updated September 10, 2026 — conversions use exact ISO unit definitions.