(a) Define and give expressions for wavelength, phase factor, phase velocity, and intrinsic wave impedance. (b) The electric field intensity of a uniform plane wave is given by \textbf{E}(z,t)=37.3\cos{(6\pi \times 10^{8}t + 2\pi z)}\textbf{a}_x Find the following: (i) Frequency. (ii) Wavelength. (iii) Phase velocity. (iv) Direction of propagation. (v) Associated magnetic field intensity vector \textbf{H}(z, t) .