A transverse periodic wave is represented by the equation y(x,t) = 2.50 cm cos(2,500 rad/s t - 15.0 m^(-1)x). What are the wavenumber k and direction of propagation of the wave?
Multiple Choice
30.0 m^(-1) traveling in the -y direction
15.0 m^(-1) traveling in the +x direction
30.0 m^(-1) traveling in the +y direction
15.0 m^(-1) traveling in the -x direction
45.0 m^(-1) traveling in the + direction