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 amplitude of the wave?

A) 6.00 mm
B) 12.0 mm
C) 3.00 mm
D) 2.00 mm
E) None of the other choices is correct.