Haryana PMT Haryana PMT Solved Paper-2010

  • question_answer
    If the momentum of an electron is changed by \[\Delta p\] then the de-Broglie wavelength associated with it changes by 0.50%. The initial momentum of electron will be

    A)  \[\frac{\Delta p}{200}\]                                               

    B)  \[\frac{\Delta p}{199}\]

    C)  \[199\Delta p\]               

    D)  \[400\Delta p\]

    Correct Answer: C

    Solution :

                    de-Broglie wavelength \[\lambda =\frac{h}{p}\] \[\Rightarrow \]               \[\lambda -\frac{0.5\lambda }{100}=\frac{h}{p+\Delta p}\] \[\Rightarrow \]               \[\frac{199\lambda }{200}=\frac{h}{p+\Delta p}=\frac{199h}{200p}\] \[\Rightarrow \]               \[p+\Delta p=\frac{200}{199}p\] \[\Rightarrow \]               \[p=199\Delta p\]


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