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Wavelength & frequency calculator

Turn a frequency into a wavelength or back, for light and radio, sound in air or water, or any wave speed.

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Wavelength 2.997925 m

How it works

λ = v ÷ f

A wave travels one wavelength in each cycle, so wave speed = frequency × wavelength. Radio and light move at 299,792,458 m/s: an FM station at 100 MHz has 3 m waves, Wi-Fi at 2.4 GHz about 12.5 cm, green light about 530 nm. Sound in air is a million times slower, so a 440 Hz “A” is about 78 cm long.

  1. λ = v ÷ f 299,792,458 m/s ÷ 100,000,000 Hz = 2.997925 m

Printed from rocketcalc.io/physics/wavelength