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JEE Main & Advanced Physics Wave Mechanics Question Bank Musical Sound

  • question_answer
    A point source emits sound equally in all directions in a non-absorbing medium. Two points \[P\]and \[Q\]are at distances of \[2m\]and \[3m\] respectively from the source. The ratio of the intensities of the waves at \[P\]and \[Q\] is                [CBSE PMT 2005]

    A)            9 : 4                                          

    B)            2 : 3

    C)            3 : 2                                          

    D)            4 : 9

    Correct Answer: A

    Solution :

               Intensity \[\propto \frac{1}{{{\text{(Distance)}}^{\text{2}}}}\] Þ  \[\frac{{{I}_{1}}}{{{I}_{2}}}={{\left( \frac{{{d}_{2}}}{{{d}_{1}}} \right)}^{2}}={{\left( \frac{3}{2} \right)}^{2}}=\frac{9}{4}\].


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