N c l n c l. Calculating frequency from wavelength For this the formula to use is f V l where f refers to the frequency V refers to the waves velocity and l refers to the waves wavelength. Wavelength l is the distance between two waves of energy traveling from one point to another point.
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Choose the velocity of the wave. To calculate select the medium or enter the speed of sound then enter the frequency and click or tap the Calculate button to calculate the wavelength. First of all determine the frequency of the wave and its type. To convert wavelength to frequency enter the wavelength in microns mm and press Calculate f and E.