An ECE student drops his cell phone in a freshwater lake but it manages to continue to work. The cell phone operates in the 2 GHz band. How deep can the phone sink in the water such that 1% of the power reaches just above the surface directly above it? Assume that fresh water has conductivity 10 times 10^3 S/m and relative permittivity epsilon_r = 81. At what distance along the surface away from a point directly above the phone will there be no power transmitted above the surface?