A Simple Harmonic Wave Described by the Equation Y(t)= 0

Multiple Choice

A simple harmonic wave described by the equation y(t) = 0.54 cos(3.1x - 2.3t) reflects from both ends of a string that is clamped at each end,resulting in a standing wave that is the sum of y(t) and its reflection.What is the amplitude of the standing wave at x = 0.22 m? The quantities x and y are in meters,and t is in seconds.

A) 0.84 m
B) 0.57 m
C) 0.67 m
D) 0.77 m