Students should be able to describe wave motion in terms of their amplitude, wavelength, frequency and period. • The amplitude of a wave is the maximum displacement of a point on a wave away from its undisturbed position. • The wavelength of a wave is the distance from a point on one wave to the equivalent point on the adjacent wave. • The frequency of a wave is the number of waves passing a point each second. • period = 1 / frequency; T = 1 / f; period, T, in seconds, s; frequency, f, in hertz, Hz. • Students should be able to identify amplitude and wavelength from given diagrams.