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

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.

Correct Answer:

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