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WB JEE Medical WB JEE Medical Solved Paper-2009

  • question_answer
    Two identical light waves, propagating in the same direction, have a phase difference\[\delta \]. After they superpose the intensity of the resulting wave will be proportional to

    A)  \[\cos \delta \]                

    B)  \[\cos \left( \frac{\delta }{2} \right)\]

    C)  \[{{\cos }^{2}}\left( \frac{\delta }{2} \right)\]                    

    D)  \[{{\cos }^{2}}\delta \]

    Correct Answer: C

    Solution :

                     Maximum intensity, \[I=4{{I}_{0}}{{\cos }^{2}}\left( \frac{\delta }{2} \right)\]                 \[\Rightarrow \]               \[I\propto {{\cos }^{2}}\left( \frac{\delta }{2} \right)\]


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