A Transverse Periodic Wave Is Established on a String

Multiple Choice

A transverse periodic wave is established on a string. The wave is described by the expression where y is in meters when x and t are in meters and seconds, respectively. If the wave travels with a speed of 20.0 m/s, what is its frequency, f?

A) 0.16 Hz
B) 0.64 Hz
C) 31.9 Hz
D) 63.7 Hz
E) 400 Hz