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

  • question_answer
    What kV  potential is to be applied on X-ray tube so that minimum wavelength of emitted  X-rays may be 1Å (\[h=6.625\times {{10}^{-34}}\]J-sec)                                                                      [UPSEAT 1999]

    A)            \[12.42\,kV\]                       

    B)            \[12.84kV\]

    C)            \[11.98kV\]                           

    D)            \[10.78kV\]

    Correct Answer: A

    Solution :

               \[{{\lambda }_{\min }}=\frac{12375}{V}{\AA}\,\Rightarrow V=\frac{12375}{1}=12375\,V\] \[=12.375\,kV\approx 12.42\,kV\]


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