1. In an EM wave traveling west, the B field oscillates vertically and has a frequency of 88.8 kHz and an rms strength of 7.8 * 10^-9 T. Determine the frequency and rms strength of the electric field. What is its direction? The electric field of an electromagnetic wave is given by Ex=E0 cos(kz + ωt), Ey = Ez = 0. Determine (a) the direction of propagation and (b) the magnitude and direction of B. 2. Emax = Bmax*c 3. For the first problem, I know how to find rms by using the equation above. What I don't understand is why the frequencies for the electric field and magnetic field are equal and why the direction of the electric field is north-south. The second question I'm also stuck on how to find the direction. Would it be similar to a traveling wave where if x and vt have the same sign then the wave travels in the decreasing x direction? So in this case it is in the decreasing z direction?