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MGIMS WARDHA MGIMS WARDHA Solved Paper-2011

  • question_answer
    In Young's experiment, the wavelength of red light is 7800Å and that of blue light is 5200Å. The value of n for which (n +1) the blue band coincides with nth red band is

    A)  1                                            

    B)  2     

    C)  3                                            

    D)   4

    Correct Answer: B

    Solution :

                     For coincidence of bonds \[\frac{nD{{\lambda }_{1}}}{d}=\frac{(n+1)D{{\lambda }_{L}}}{d}\] \[n{{\lambda }_{1}}=(n+1){{\lambda }_{L}}\] \[7800n=5200(n+1)\Rightarrow n=2\]


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