Amonochromatic plane wave of frequency 50 mhz and average inten- sity 100 w/m2 is propagating vertically downwards in a floating ice slab. the wave encounters the plane interface between the ice and the sea-water below. the relative permittivity of ice at this frequency is 3.2 and its conductivity is negligible. the relative permittivity of sea water at this frequency, at near freezing temperatures, is about 86 and the conductivity is about 3 s/m. (a) calculate the intensity of the wave which is reflected from the interface. (b) calculate the rms amplitude of the electric field of the wave transmitted into the sea water (c) calculate the distance the wave in the sea water travels before its amplitude falls to 10% of the value found in part (b).