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    Question

    Which of the following is a characteristic of sound

    waves?
    A They are longitudinal waves. Correct Answer Incorrect Answer
    B Their speed depends on the medium. Correct Answer Incorrect Answer
    C They are produced by vibrations. Correct Answer Incorrect Answer
    D All of the above Correct Answer Incorrect Answer

    Solution

    Sound waves are longitudinal, meaning the vibrations move parallel to the direction of the wave.  Their speed varies depending on the medium (fastest in solids, slowest in gases).  Sound is produced by vibrating objects, transmitting energy through a medium.

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