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KVPY Sample Paper KVPY Stream-SX Model Paper-3

  • question_answer
    A beam of electrons striking a copper target produces X-rays. Its spectrum is as shown. Keeping the voltage same if the copper target relative is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparison with old as:

    A) Cut-off wavelength will remain unchanged while characteristic lines will be different.

    B) Both cut-off wavelength and characteristic lines will remain unchanged.

    C) Both cut-off wavelength and characteristic lines will be different.

    D) Cut-off wavelength will be different while characteristic lines will remain unchanged.

    Correct Answer: A

    Solution :

    Cut off wavelength of emitted X-rays depends on maximum kinetic energy of incident electrons on the target and is independent of nature of target. The characteristic lines depend on nature of material of target.


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