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Visual science, lambda (14/40) Wavelength lambda measures the distance between the crests of a wave, many different things can move like waves like water, strings, air(sound) the floor, and light can be treated as a wave. With regard to sound waves, to play most musical instruments you create standing waves on a string or in a pipe or tube. The perceived pitch of the sound is related to the frequency of the wave. The higher the frequency the higher is the pitch which will equate to a shorter wavelength, lambda.