Which statement best describes how GPR signal attenuation behaves with distance from the source?

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

Attenuation in GPR is distance-dependent and varies along the path because multiple loss mechanisms interact as the wave travels. As the radar pulse propagates, it spreads out energy over a larger area (geometric spreading), so the amplitude decreases with distance. At the same time, the medium itself damps the wave—conductivity and dielectric losses absorb energy—and this intrinsic attenuation accumulates with range and is often stronger at higher frequencies. The combination of spreading loss and frequency-dependent, distance-related material loss means the amount of attenuation changes with how far the signal has traveled and through which subsurface tissues it passes. That makes the attenuation nonuniform with distance, which is why the statement describing it as not uniform is the best description. In real surveys, closer targets appear with stronger, higher-frequency content, while farther targets show greater overall loss and a shift toward lower frequencies.