JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Matter Waves

  • question_answer
    If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor     [AIEEE 2005]

    A)            \[\frac{1}{\sqrt{2}}\]        

    B)            \[\sqrt{2}\]

    C)            \[\frac{1}{2}\]                      

    D)            2

    Correct Answer: A

    Solution :

               \[\lambda =\frac{h}{\sqrt{2mE}}\] Þ \[\lambda \propto \frac{1}{\sqrt{E}}\]. 


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