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

  • question_answer
    When the kinetic energy of an electron is increased, the wavelength of the associated wave will

    A)            Increase

    B)            Decrease

    C)            Wavelength does not depend on the kinetic energy

    D)            None of the above

    Correct Answer: B

    Solution :

               \[\lambda =\frac{h}{p}=\frac{h}{\sqrt{2mE}};\ \ \therefore \ \lambda \propto \frac{1}{\sqrt{E}}\] (h and m = constant)


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