y (m) t=0 seconds 20 -20 4 Shown below is a transverse wave, moving to the right (positive x-direction). The period of oscillation is 6 seconds. (The arrow is there to help you see the motion of the wave to the right.) -15 -10 $5 30 20 10 D -10 -20 x (m) $ 10 15 20 t = 2 seconds: 30 20 y (m) 10 0 -20 15 10 15 15 10 15 20 10 2. 20 -30 x (m) t = 4 seconds 30 y (m) 10 20 5 8 5 8 8 -20 -15 -10 -5 0 5 10 15 20 10 t = 6 seconds 30 20 y (m) 30 x (m) 10 D -20-15-10 5 10 15 20 -10 -20 30 x (m) (a) Obtain the wavelength of the wave. (b) Obtain the speed of the wave. (c) Write the wave equation for this wave.