A traveling wave has displacement given by y (x,t) = (2.0 cm) x cos(2px-4pt), where x is measured in cm and t in s.
a.) Draw a snapshot graph of this wave at t= 0s
b.) On the same set of axes, use a dotted line to show the snapshot graph of the wave at t= 1/8 s
c.) What is the speed of the wave?