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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2011

  • question_answer
    Two monochromatic  light  waves  of amplitudes \[3A\] and \[2A\] interfering at a point have a phase difference of\[60{}^\circ \]. The intensity at that point will be proportional to

    A) \[5\text{ }{{A}^{2}}\]           

    B)  \[13\text{ }{{A}^{2}}\]

    C)  \[7\text{ }{{A}^{2}}\]

    D)  \[19\text{ }{{A}^{2}}\]

    Correct Answer: D

    Solution :

    Here, \[A=\sqrt{A_{1}^{2}+A_{2}^{2}+2{{A}_{1}}{{A}_{2}}\cos \theta }\] \[I=9{{A}^{2}}+4{{A}^{2}}+2\times 3A\times 2A\times \frac{1}{2}\] \[I=19{{A}^{2}}\]


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