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CMC Medical CMC-Medical Ludhiana Solved Paper-2012

  • question_answer
    In Youngs double slit experiment, how many maxima can be obtained on a screen (with central maxima) on both sides of the central fringe if d = 7000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] and \[\overset{\text{o}}{\mathop{\text{A}}}\,\]= 2000\[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    A)  7                                            

    B)  10

    C)  12                                         

    D)  18

    Correct Answer: A

    Solution :

                    For maximum intensity on the screen \[d\,\sin \theta =n\lambda \] or            \[\sin \theta =\frac{n\lambda }{d}=\frac{n\,(2000)}{7000}=\frac{n}{3.5}\] Since the maximum value of \[\sin \theta =1\] \[\therefore \]  n = 0, 1, 2 and 3 only So, only seven maximas can be obtained on both sides of the screen.


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