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    Question

    Repetition of sound produced by reflection of sound

    waves is called-
    A Noise Correct Answer Incorrect Answer
    B Note Correct Answer Incorrect Answer
    C Double Correct Answer Incorrect Answer
    D Echo Correct Answer Incorrect Answer

    Solution

    Echo: If we shout or clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later. This sound which we hear is called an echo. ┬аEchoes are heard due to the phenomenon of Reflection of sound waves. To hear the echo clearly, the reflecting object must be more than 17.2 m from the sound source for the echo to be heard by a person standing at the source.

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