A source in vacuum emits electromagnetic radiation in every direction. At a point P, located 40m away from the source the electric field is E (z,t) = 10V/m îcos(kz+ 1.6Ã-10^7 radians/s t).
a) Determine the direction of energy transfer at point P.
b) Calculate the frequency and wavelength of this wave.
c) Write down the magnetic field (vector) as a function of position and time only, at point P.