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

  • question_answer
    In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å         [CPMT 1982; NCERT 1986, 87]

    A)            10 kV                                       

    B)            20 kV

    C)            30 kV                                       

    D)            40 Kv

    Correct Answer: D

    Solution :

                       From the formula                     \[V=\frac{12375}{{{\lambda }_{\min }}}=\frac{12375}{0.3094}\]\[=39.99\,\,kV\,\approx \,40\,kV\]


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