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

  • question_answer
    The \[{{K}_{\alpha }}\]X-ray emission line of tungsten occurs at \[\lambda =0.021\]\[nm\]. The energy difference between K and L levels in this atom is about                                                        [IIT 1997 Cancelled]

    A)            0.51MeV

    B)            1.2 MeV

    C)            59 KeV                                    

    D)            13.6 eV

    Correct Answer: C

    Solution :

               \[{{E}_{K}}-{{E}_{L}}=\frac{hc}{\lambda }\]\[=\frac{(6.6\times {{10}^{-34}})\,\,(3\times {{10}^{8}})}{(0.021\times {{10}^{-9}})\,\,(1.6\times {{10}^{-19}})}eV\]=59keV


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