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Wavelength is measured in distance (ft. of m)

The actual physical length of a single cycle of a wave

Wavelength = speed of sound / Frequency in Hz

λ = SOS/f

wavelength = speed of sound * period

λ = SOS*T

The wavelength of a sound wave varies greatly with the frequency of the wave. A 20 kHz wave has a wavelength of 1.72 (0.7 in)cm while a 20 Hz wave has a wavelength of 17.2 m (~56 ft.).

Examples http://iam.colum.edu/MTD2/lectures/week1_examples.htm