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9th Class Science Sound Question Bank Sound

  • question_answer
    A tuning fork of frequency \[420\,\,Hz\] completes \[70\] vibrations. Find the distance travelled by sound in air.\[(v=360\,\,m\,\,{{s}^{-1}})\]

    A) \[20\,\,m\]         

    B)        \[50\,\,m\]

    C) \[60\,\,m\]           

    D)        \[80\,\,m\]

    Correct Answer: C

    Solution :

    Distance travelled by sound in air\[=\] speed \[\times \] time taken     \[=360\times \frac{70}{420}=60\,\,m\]


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