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

  • question_answer
    If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be                                           [MP PET 2002; RPMT 1995; CBSE PMT 1996]

    A) \[\frac{1227}{\sqrt{V}}{AA}\]                                         

    B) \[\frac{1240}{V}{AA}\]

    C) \[\frac{2400}{V}{AA}\]   

    D) \[\frac{12400}{V}{AA}\]

    Correct Answer: D

    Solution :

    \[{{\lambda }_{\min }}=\frac{hc}{eV}=\frac{6.6{{\times }^{-34}}\times 3\times {{10}^{8}}}{1.6\times {{10}^{-19}}V}\]\[=\frac{12375}{V}\approx \frac{12400}{V}{AA}\]


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