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    Question

    What is the minimum distance one has to stand at from a

    wall to hear an echo?
    A 9.4 m Correct Answer Incorrect Answer
    B 17.2 m Correct Answer Incorrect Answer
    C 17.2 cm Correct Answer Incorrect Answer
    D 9.4 cm Correct Answer Incorrect Answer

    Solution

    The correct answer is B

    Practice Next

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