Question

    Among the followingmaterialssound travels fastest in

    A Steel Correct Answer Incorrect Answer
    B Air Correct Answer Incorrect Answer
    C Vacuum Correct Answer Incorrect Answer
    D Water Correct Answer Incorrect Answer

    Solution

    Thespeedofsoundisthedistance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at 20°C(68°F),the speedof soundis343.2 metres per second (1,126 ft/s). the speed of soundvariesfromsubstancetosubstance.Sound travels faster in liquids and non-porous solids than it does in air.

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