17) Such a wave could be described by the following
equation
FIGURE 10 17 (a) The curves represent the displacement of a string at
t = 0 and at t = Dt, respectively when a sinusoidal wave is propagating
in the +x-direction (b) The curve represents the time variation
of the displacement at x = 0 when a sinusoidal wave is propagating
in the +x-direction