1.
The electric field part of an electromagnetic wave in a medium is represented by: Ex=0E_x = 0, Ey=2.5cos(2π×106tπ×102x)E_y = 2.5 \cos(2\pi \times 10^6 t - \pi \times 10^{-2} x) N/C, Ez=0E_z = 0. The wave is: