Which of the following is a type of object that absorbs RADAR energy?

The choice of sand as a type of object that absorbs RADAR energy is correct because sand particles, particularly when dry, have a rough surface that interacts with radar waves. When radar energy strikes sand, a significant amount of the energy is not reflected back; instead, it is absorbed or scattered due to the texture and composition of the particles. This absorption effect diminishes the radar signal that could bounce back to the radar unit, making it challenging to detect objects that may be partially or fully covered by sand.

In contrast, glass, metal, and plastic tend to reflect radar energy effectively. Metal is particularly known for its reflective properties, often used in applications where radar visibility is desired, such as in vehicles and buildings. Glass can reflect some radar energy, but its effectiveness can vary based on thickness and angle. Plastic, depending on its surface texture and density, may also reflect radar waves. However, their ability to absorb radar energy is not as pronounced as that of sand, making them less effective in this context. Understanding these properties helps in interpreting radar data and how different materials interact with radar signals.