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    Question

    Sound travels fastest in which

    medium?  
    A Vacuum Correct Answer Incorrect Answer
    B Air Correct Answer Incorrect Answer
    C Water Correct Answer Incorrect Answer
    D Iron Correct Answer Incorrect Answer

    Solution

    Sound needs a medium to travel; it travels fastest in solids, especially metals like iron.   In solids, particles are tightly packed, allowing faster vibrations.   In gases, particles are far apart, so sound is slowest.   Sound cannot travel in vacuum.

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