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  3. 9th Class
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9th Class Science Sample Paper Science Olympiad Model Test Paper-19

  • question_answer
    A source of frequency of 500 Hz emits waves of wavelength 0.4 m. How long does the waves take to travel 600 m?

    A) 3 s

    B) 5 s

    C) 8 s

    D) 9 s

    E) None of these

    Correct Answer: A

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