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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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