What happens when radio waves bounce off an object?

When radio waves bounce off an object, this phenomenon is known as reflection. In reflection, the waves hit a surface and change direction instead of passing through or being absorbed by that surface. This concept is fundamental in understanding how radar and various forms of speed measurement technology, such as those used in law enforcement, operate.

Reflection allows radar systems to detect the presence and speed of an object by analyzing the waves that bounce back. The characteristics of the reflecting surface, as well as the angle at which the waves strike it, can significantly influence the strength and quality of the reflected signal. This principle is critical in interpreting data collected from radar systems to maintain accurate speed assessments and improve safety measures.

The other options refer to different interactions of waves with materials: refraction involves waves changing direction when entering a different medium, transmission means waves pass through a material, and absorption occurs when the energy of the waves is taken in by the object rather than reflected.