Physics
Waves Vibrations and Oscillations

How do you calculate wavelength without frequency?

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Wiki User
04/25/2008

You can measure the wavelength without knowing the frequency. This is done by measuring the "nodes" between similar points of a single-frequency continuous wave. All you need is some simple lab equipment. http://www.ted.com/index.php/talks/view/id/237 [the guy measures the wavelength]

You can calculate the wavelength as follows: Wavelength times Frequency =Velocity (phase velocity in that medium) So the speed of sound in air is about 344 m/s. If the frequency is 1000 Hz, then the wavelength is 344/1000=.344 m. But in this simple relationship you can't call both wavelength and frequency unknowns. You have to have in hand one or the other. See: http://en.wikipedia.org/wiki/Wavelength