A wave traveling in the positive x-direction is pictured in Figure (a). Find the amplitude, wavelength, speed, and period of the wave if it has a frequency of 8.00 Hz. In Figure (a), Ax = 40.0 cm and Ay = 15.0 cm. Ay Ay A p x STRATEGY The amplitude and wavelength can be read directly from the figure: The maximum vertical displacement is the amplitude, and the distance from one crest to the next is the wavelength. Multiplying the wavelength by the frequency gives the speed, whereas the period is the reciprocal of the frequency.