Answer:
Electromagnetic propagation through water is very different from propagation through air because of water's high permittivity and electrical conductivity. Plane wave attenuation is high compared to air, and increases rapidly with frequency.
And the results show that the effect of sand with electric charges all over its surface on electromagnetic wave attenuation is the same as that of sand without charge, which proves that electric charges distribute on partial surface of the sand in fact.
Explanation:
