JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2014

  • question_answer
    A source and a listener are both moving towards each other with speed \[1.11f\], where v is the speed of sound. If the frequency of the note emitted by the source is \[1.22f\], the frequency heard by the listener would be nearly

    A) f                                

    B) \[1.27f\]  

    C)                        \[\text{1}.0\text{1}\times \text{1}{{0}^{\text{5}}}\text{ N}/{{\text{m}}^{\text{2}}}\]                                                

    D)                        \[\text{9}.\text{13}\times \text{1}{{0}^{\text{4}}}\text{ N}/{{\text{m}}^{\text{2}}}\]

    Correct Answer: B

    Solution :

                    Source and observer both are moving, so apparent frequency                         \[\text{9}.\text{13}\times \text{1}{{0}^{\text{3}}}\text{N}/{{\text{m}}^{\text{2}}}\]                                                            \[\text{18}.\text{26 N}/{{\text{m}}^{\text{2}}}\] where,     v = speed of sound                                               \[\text{2}.\text{25}\times \text{1}{{0}^{\text{3}}}\text{min}\]                                               \[\text{3}.\text{97}\times \text{1}{{0}^{\text{3}}}\text{min}\]                                                                        \[9.13\times {{10}^{3}}N/{{m}^{2}}\]


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