The Vertical Displacement Due to a Traveling Wave Moving Horizontally $\pi$

question 23

Multiple Choice

The vertical displacement due to a traveling wave moving horizontally is given by y(x,t) = 5.4 cos (0.4(rad/cm) x - 45(rad/s) t (sec) ) where x and y are in centimeters.The horizontal distance between the points whose phase differs by $\pi$ /3 rad is

• A)1.05 cm.
• B)2.62 cm.
• C)7.86 cm.
• D)9.81 cm.
• E)13.6 cm.