GPR describes which phenomenon?

Study for the BICSI OSP Design Test. Prepare using multiple choice questions, with hints and explanations to enhance understanding. Succeed in your exam journey!

Ground-penetrating radar uses high-frequency electromagnetic waves transmitted into the ground and records reflections from subsurface boundaries. The reflections occur where the soil’s dielectric properties change, such as at contacts between different materials or when a buried object is encountered. By measuring how long the waves take to return and knowing the wave speed in the ground, you can image what's below the surface. This is an electromagnetic phenomenon, not a magnetic field, a chemical reaction in soil, a seismic (mechanical) wave, or a voltage generated by soil resistance.