The Wave Equation for a Standing Wave on a String $y ( x , t ) = 24 \cos ( 3.0 x ) \cos ( 2 t )$

Multiple Choice

The wave equation for a standing wave on a string fixed at both ends is $y ( x , t ) = 24 \cos ( 3.0 x ) \cos ( 2 t )$ cm. The speed of the traveling waves that result in this standing wave is

A) 0.67 m/s.
B) 1.5 m/s.
C) 8.0 m/s.
D) 1.5 cm/s.
E) 0.67 cm/s.