KVPY Sample Paper KVPY Stream-SX Model Paper-25

  • question_answer
    In an x-ray tube, if the accelerating potential difference is changed, then:

    A) the frequency of characteristic x-rays of a material will get changed

    B) number of electrons emitted will change

    C) the difference between \[{{\lambda }_{0}}\] (minimum wavelength) and\[{{\lambda }_{\,k\,\alpha }}\](wavelength of \[{{k}_{\alpha }}\] x-ray) will get changed

    D) difference between \[{{\lambda }_{\,k\,\alpha }}\] and \[{{\lambda }_{\,k\,\beta }}\] will get changed.

    Correct Answer: C

    Solution :

    As the accelerating potential difference is changed only the minimum wavelength changes.
    It has no effect on wavelengths of characteristic x-rays (whether they are produced or not)
    \[\therefore \][c] is the correct choice.

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