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JEE Main & Advanced Physics Wave Mechanics Question Bank Basics of Mechanical Waves

  • question_answer
    A point source emits sound equally in all directions in a non-absorbing medium, Two points P and Q are at distance 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 \[\propto \frac{1}{{{(\text{Distance})}^{2}}}\] 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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