North Carolina RADAR State Practice Exam

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What target composition will "refract" a RADAR signal?

  1. Glass, plastics

  2. Metal, stone

  3. Sand, earth

  4. Leaves, trees

The correct answer is: Glass, plastics

Refracting a RADAR signal occurs when the signal passes through a medium where the index of refraction is different, leading to a change in the direction of the wave. Glass and plastics are known for their ability to refract light due to their transparent and diverse chemical structures, which allow them to alter the path of electromagnetic waves effectively. In contrast, materials like metal and stone do not refract RADAR signals significantly; instead, they tend to reflect or absorb them. Sand and earth may cause some scattering or attenuation but typically do not exhibit strong refractive properties. Leaves and trees are more complex, as they can scatter signals but do not primarily refract them like glass and plastics do. Therefore, the best choice for materials that would refract RADAR signals is glass and plastics, accurately reflecting the principles of wave behavior in different mediums.

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