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  20,000 Hz(which is  20 kHz). As this is above the normal hearing range for humans, we cannot hear ultrasound.

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