Determine: 4. Suy pose in a certain mecium with 12 = 240 [12], the electric field intensity is given by Elect) = 480 .cos(wt +10x): Y hol. the direction of wave propagation 4.2. the wave polavization 4.3. the maquetic field wintexity vector H (se,t). HINT: F(x,t) = Ho.e **Os (cut +3 x) and