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

  • question_answer
    When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts [MP PMT 1993; NCERT 1984; MNR 1995; RPMT 2002]

    A)            0.25 Å                                      

    B)            0.5 Å

    C)            1.5 Å                                        

    D)            1.0 Å

    Correct Answer: A

    Solution :

               \[{{\lambda }_{\min }}=\frac{12375}{40,000}=0.30\,{\AA}\] Hence wavelength less than 0.30 Å is not possible.


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