The electric field intensity of a linearly polarized uniform plane wave propagating in the +z-direction in seawater is E = a, 100 cos(6×10°) (V/m) at z = 0. The constitutive parameters of seawater are &, 72, μ, = 1, and σ= 4 (S/m). (a) Determine the attenuation constant (a), the phase constant (B), the complex intrinsic impedance (77), the phase velocity (vp), the wavelength (2), and the skin depth (8) of the wave. (b) Find the distance at which the amplitude of E is 1% of its value at z = 0. (c) Write the expressions for E(z,t) and H(z,t) at z = 0.2 (m) as functions of t.