2. Questions Bank
  3. 9th Class
  4. Science
  5. Work and energy

9th Class Science Work and energy Question Bank Work, Energy and Sound

  • question_answer
    A sound-wave source produces 40 crests and 40 troughs in 0.4 second. Find the frequency of the wave.

    A) 40 hz

    B)                    400 hz

    C) 100 hz  

    D)        10.4 hz

    E) None of these

    Correct Answer: C

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