The semi-infinite regions z < 0 and z > 1 m are free space. For 0 < z < 1 m, ∈'_r = 4, μ_r = 1, and r = 0. A uniform plane wave with ω = 4 × 10⁸ rad/s is traveling in the a_z direction toward the interface at z = 0.

(a) Find the standing wave ratio in each of the three regions.

(b) Find the location of the maximum |E| for z < 0 that is nearest to z = 0.