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    Question

    What is the frequency of Ultrasonic

    Waves?
    A > 2000 Hz Correct Answer Incorrect Answer
    B > 20,000 Hz Correct Answer Incorrect Answer
    C < 20,000 Hz Correct Answer Incorrect Answer
    D < 2000 Hz Correct Answer Incorrect Answer

    Solution

    The range of human hearing is about 20Hz to 20,000 Hz. Ultrasound waves have frequencies more than┬а 20,000 Hz(which is┬а 20 kHz). As this is above the normal hearing range for humans, we cannot hear ultrasound.

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