7.34A wave traveling in a nonmagnetic medium with &, = 9is characterized by an electric field given by \begin{aligned} \mathbf{E}=[\hat{\mathbf{y}} 3& 3 \cos \left(\pi \times 10^{7} t+k x\right) \\ &\left.-\hat{\mathbf{z}}

2 \cos \left(\pi \times 10^{7} t+k x\right)\right] \end{aligned} Determine the direction of wave travel and average powerdensity carried by the wave. Determine the direction of wave travel and average powerdensity carried by the wave.