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9th Class Science Sound Question Bank Sound

  • question_answer
    A worker lives at a distance of \[1.32\,\,km\] from the factory. If the speed of sound in air is\[330\,\,m\,\,{{s}^{-1}}\], how long will the sound of factory siren take to reach the worker?

    A) \[1\,\,s\]                        

    B) \[2\,\,s\]

    C) \[3\,\,s\]            

    D)        \[4\,\,s\]  

    Correct Answer: D

    Solution :

    \[v=\frac{s}{t}\Rightarrow t=\frac{s}{v}=\frac{1320}{330}=4\,\,s\]


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