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    Question

    Among the given options, which one causes an

    echo?
    A When sound is reflected Correct Answer Incorrect Answer
    B When sound waves travel through a solid medium Correct Answer Incorrect Answer
    C When sound waves travel through a liquid medium Correct Answer Incorrect Answer
    D When sound waves travel through a vacuum Correct Answer Incorrect Answer

    Solution

    An echo is caused by: When sound is reflected.

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