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  3. 9th Class
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9th Class Science Sample Paper Science Olympiad Model Test Paper-16

  • question_answer
    How long a sound wave takes to travel 1.5 km if its frequency is 2 kHz and wave length is 35 cm?

    A) 2.4 s    

    B) 1.8 s

    C) 3.4 s    

    D) 2.1 s

    E) None of these

    Correct Answer: D

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