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5th Class Science Sample Paper Science Olympiad Model Test Paper-7

  • question_answer
    What should be the minimum distance of sound source from the reflecting surface, so that echo of the sound can be heard? (Assume the speed of sound in air is 344 m/s)

    A) 25.0 cm

    B) 17.2 m

    C) 8.25 m

    D) 2.5 m

    E) None of these

    Correct Answer: B

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