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# How does wavelength change as frequency increases?

The wavelength decreases as the frequency increases.

The wavelength ##λ## is the distance between successive peaks in a wave.

The frequency ##f## of a wave is the number of complete waves that pass a point in a given time.

Above we see two sound waves travelling through space at the same velocity ##v##.

The red dot follows the amplitude of the wave as it goes by.

The frequency of oscillation of the dot is the frequency ##f## of the wave. The second wave has twice the frequency of the first.

You can see that the wavelength is halved when the frequency is doubled.

The frequency ##f## and wavelength ##λ## are related to one another and to the speed of the wave ##v## by the formula

##fλ = v##.

Since ##v## is constant, if ##f## increases, ##λ## must decrease, and vice versa.