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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        The minimum distance of a reflector to hear the echo of monosyllabic sound is (speed of sound is\[330\text{ }m{{s}^{-1}}\])

    A)  16.5 m                                 

    B)  33 m

    C)  165 m                                  

    D)  330m

    Correct Answer: B

    Solution :

                    Monosyllabic sound reaches the listener after reflection in\[\frac{1}{5}s\]. Distance between source and listener is \[d=v\left( \frac{t}{2} \right)=330\times \left( \frac{1}{2}\times \frac{1}{5} \right)\] \[d=330\times \left( \frac{1}{10} \right)=33\,m\]


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