BHU PMT BHU PMT (Mains) Solved Paper-2006

  • 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:

    A)  no interference is observed

    B)  fringe width increases

    C)  fringe width decreases

    D)  fringe width remains same

    Correct Answer: C

    Solution :

                     As velocity (or momentum) of electron is increased, the wavelength\[\left( \lambda =\frac{h}{p} \right)\]will decrease. Hence, fringe width will decrease\[(\beta \propto \lambda ).\]


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