A linearly polarized electromagnetic wave in vacuum is \(E=3.1\cos \left[(1.8)z-\left(5.4\times {10}^{6}\right)t\right]\…

The frequency of electromagnetic wave is \(54\times {10}^{4}\) \(\mathrm{Hz}\).

The transmitted wave will be \(3.1\cos \left[(1.8)z-\left(5.4\times {10}^{6}\right)t\right]\overset{^}{i}N/C\)

The reflected wave will be \(3.1\cos \left[(1.8)z+\left(5.4\times {10}^{6}\right)t\right]\overset{^}{i}N/C\)

The wavelength is \(5.4\mathrm{m}\)