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      Question

      To measure the speed of an approaching car a police

      officer shines –
      A light waves on it Correct Answer Incorrect Answer
      B microwaves on it Correct Answer Incorrect Answer
      C radio waves on it Correct Answer Incorrect Answer
      D ultra high frequency waves on it Correct Answer Incorrect Answer

      Solution

      Radar, which stands for radio detection and ranging, is a system that uses reflected radio waves to detect objects and measure their distance and speed. For example, police use radar to calculate the speed of cars.

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