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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Critical Thinking

  • question_answer
    A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then  [IIT-JEE (Screening) 2005]

    A)            No interference is observed

    B)            Fringe width increases

    C)            Fringe width decreases

    D)            Fringe width remains same

    Correct Answer: B

    Solution :

               Momentum of the electron will increase. So the wavelength (l = h/p) of electrons will decrease and fringe width decreases as b µ l.


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