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    Question

    Which of the following statements is true about

    sound?┬а┬а
    A Sound can travel in vacuum Correct Answer Incorrect Answer
    B Sound needs a medium to travel Correct Answer Incorrect Answer
    C Sound travels faster than light Correct Answer Incorrect Answer
    D Sound does not reflect Correct Answer Incorrect Answer

    Solution

    Sound is a mechanical wave, so it needs a medium like air, water, or solids.┬а┬а It cannot travel in vacuum (like in space).┬а┬а This is why no sound can be heard in outer space.┬а┬а Reflection of sound is used in SONAR and echo.

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