The Vertical Displacement of a String Is Given by Y(x,t)

Multiple Choice

The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m^-1) x - (7.22 s^-1) t]. What is the period of the wave?

A) 7.22 s
B) 1.93 s
C) 0.870 s
D) 0.308 s
E) 0.139 s