A prgressive wave in one dimension given by the equation ${\displaystyle u(x,t)=A\sin \left({\frac {2\pi }{\lambda }}x-\omega t\right)}$. where

• u is the momentary disturbance
• λ is the wavelength
• t is the time
• ω is the angular frequency = 2πf
• \tau is the period of the wave = 1/f