Ignoring reflection at the air$-$soil boundary, if the amplitude of incident wave is $10$ V$/$m at the surface of a wet soil medium, at what depth will it be down to $1$ V$/$m$.$ Wet soil is characterized by $=1,=9,=5104.$ Solve the question for: a$-)$ f$=3$ GHz b$-)$ f$=10$ GHz c$-)$ f$=30$ GHz