PLEASE PROVIDE FULL SOLUTION

At $5$ MHz a lossy material is characterized by $=3\mathrm{.}6{}_o,=2\mathrm{.}1{}_o$ and $=0\mathrm{.}08(\frac{S}{m}).$ If $\frac{?}{\text{b}\text{a}\text{r}}(E)=$hat$(a{)}_{z}6e^{-x}(\frac{V}{m}),$ compute:

a$)$ The propagation constant,

b$)$ The wavelength $$ and the phase velocity $u_p.$