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Manipal Medical Manipal Medical Solved Paper-2011

  • question_answer
    In Youngs experiment, the wavelength of red light is\[7800\overset{o}{\mathop{\text{A}}}\,\] and that of blue light is\[5200\overset{o}{\mathop{\text{A}}}\,\]. The value of n for which\[(n+1)th\] blue band coincides with nth red band is

    A)  1                

    B)  2

    C)  3                

    D)  4

    Correct Answer: B

    Solution :

     For coincidence of bands Or \[\frac{nD{{\lambda }_{1}}}{d}=\frac{(n+1)D{{\lambda }_{2}}}{d}\] or      \[n{{\lambda }_{1}}=(n+1){{\lambda }_{2}}\] \[7800n=5200\text{ }(n+1)\] or          \[n=2\]


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