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9th Class Science Sound Question Bank Sound

  • question_answer
    A construction worker working at a height of \[78.4\,\,m\] above the ground bends and his helmet slips falls down. He hears the sound of the helmet hitting the ground \[0.23\] seconds after it slipped. Find the speed of sound in air.

    A) \[512\,\,m\,\,{{s}^{-1}}\]                     

    B) \[215\,\,m\,\,{{s}^{-1}}\]

    C) \[341\,\,m\,\,{{s}^{-1}}\]                       

    D) \[651\,\,m\,\,{{s}^{-1}}\]

    Correct Answer: C

    Solution :

    \[\Rightarrow \upsilon =\frac{\text{Distance}}{\text{Time}}=\frac{78.4\,\,m}{0.23\,\,s}=341\,\,m\,\,{{s}^{-1}}\]


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