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    Question

    Which statement is true regarding infrasound?

    A It is a high-frequency sound wave. Correct Answer Incorrect Answer
    B It is used in medical diagnostics. Correct Answer Incorrect Answer
    C Microbarometers detect changes caused by infrasounds. Correct Answer Incorrect Answer
    D It is audible to humans. Correct Answer Incorrect Answer

    Solution

    Infrasound refers to sound waves with frequencies below the human hearing threshold, typically below 20 Hertz. Microbarometers are instruments specially designed to detect these low-frequency sounds, which can be caused by natural phenomena like volcanoes or man-made events.

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