a. Write down an E(z,t) and a B(z,t) travelling wave of an EM wave in terms of k and w. What are these constants and the speed of the wave in terms of the wavelength A and the frequency f of the wave? b. What are the energy densities stored in an electric and a magnetic field? c. What is the total instantaneous energy stored per unit volume in a region of space where there is an EM wave? Seeing that that c = express this in terms of the B - field. d. Express the Poynting vector in terms of the B- field. e. What is the time averaged Poynting vector in terms of Eo or Bo (in terms of Ems or Brms). What is the intensity / of the wave?

a. Write down an E(z,t) and a B(z,t) travelling wave of an EM wave in terms of k and w. What are these constants and the speed of the wave in terms of the wavelength A and the frequency f of the wave? b. What are the energy densities stored in an electric and a magnetic field? c. What is the total instantaneous energy stored per unit volume in a region of space where there is an EM wave? Seeing that that c = express this in terms of the B - field. d. Express the Poynting vector in terms of the B- field. e. What is the time averaged Poynting vector in terms of Eo or Bo (in terms of Ems or Brms). What is the intensity / of the wave?