The electric field of an electromagnetic wave travelling in vacuum described by the t is in the following wave function: E=(5.00V/m) cos [kx-(6.00 X 10^9s^-1)t + 0.40]j, where k X -(6.00 X 10^9 s^-1) t+ 0.40]j, where k = the wave number in r/m, x is in m, t is in seconds. Find (a) amplitude; (b) frequency; (c) wavelength; (d) the direction of the travel of the wave; (e) the associated magnetic field wave.