4. A continuous sinusoidal wave is traveling on a string with speed 82.6 cm/s. The displacement of the particles of the string at x=9.60 cm is found to vary with time according to the equation y = (5.12 cm) sin [(1.16 rad) - (4.08 rad/s)]. The linear mass density of the string is 3.86 g/cm. (a) Find the frequency of the wave. (b) Find the wavelength of the wave. (c) Write the general equation giving the transverse dis- placement of the particles of the string as a function of posi- tion and time. (d) Calculate the tension in the string.