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  1. To measure the speed of an approaching car a police officer shines

    2. A.

     Light waves on it
    B.

     Microwaves on it
    C.

     Radio waves on it
    D.

     Ultra high frequency waves on it

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    Answer : Option C

    Explanation :

    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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