The value 0.5 cm does not represent any of the options given. The amplitude refers to the maximum displacement of a wave from its equilibrium position. The wavelength refers to the distance between two corresponding points on a wave, such as two adjacent peaks or troughs. The equilibrium is the resting or undisturbed position of a wave. Frequency, on the other hand, refers to the number of complete cycles of a wave that occur in a unit of time.