Which of the following materials reflects RADAR beams well?

Metal reflects RADAR beams well due to its conductive properties and smooth surface, which allows for the efficient return of the emitted signals. When RADAR waves hit a metal surface, they are reflected back towards the radar source with minimal absorption. This strong reflection makes metal an ideal target for RADAR systems, enabling accurate distance and speed measurements.

In contrast, materials like plastic and glass are typically less effective at reflecting RADAR waves due to their non-conductive nature and varying surface textures, which can absorb or scatter the signals instead of reflecting them. Leaves, being organic material, also do not reflect RADAR signals well, as they can absorb energy and their shapes and structures can scatter the waves, further reducing the likelihood of a strong return signal.