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9th Class Science Sound Question Bank Sound

  • question_answer
    The frequency of a sound wave is \[200\,\,Hz\] and its wavelength is\[150\,\,cm\]. What is the distance travelled by the sound wave in I the time taken to produce \[150\] waves?

    A) \[110\,\,cm\]                  

    B) \[225\,\,cm\]

    C) \[112.5\,\,cm\]                 

    D) \[336.5\,\,cm\]

    Correct Answer: C

    Solution :

    For \[150\] waves, the time taken is\[v=\frac{\lambda }{f}=\frac{150}{200}s=\frac{3}{4}s\] The distance travelled to produce \[150\] sound waves. \[=\lambda \times T=150\,\,cm\times \frac{3}{4}s=112.5\,\,cm\]


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