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VIT Engineering VIT Engineering Solved Paper-2008

  • question_answer
    A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?

    A)   Diffraction pattern is not observed on the screen in the case of electrons

    B)   The angular width of the central maximum of the diffraction pattern will increase

    C)   The angular width of the central maximum will decrease

    D)   The angular width of the central maximum will remains the same  

    Correct Answer: C

    Solution :

    Angular fringe width is the ratio of fringe width to distance  of screen from the source ie, \[\theta =\frac{\beta }{D}\] As D is taken large, hence angular fringe width of the central maximum will decrease.


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