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KVPY Sample Paper KVPY Stream-SX Model Paper-17

  • question_answer
    The edge lengths of the unit cells in terms of the radius of spheres constituting fcc, bcc and simple cubic unit cell are respectively -

    A) \[2r,\,\]\[\frac{4r}{\sqrt{3}},\]\[2\sqrt{2r}\]

    B) \[\frac{4r}{\sqrt{3}},\]\[2\sqrt{2r},\]\[2r\]

    C) \[2r,\,\]\[2\sqrt{2r},\]\[\frac{4r}{\sqrt{3}}\]

    D) \[2\sqrt{2r},\]\[\frac{4r}{\sqrt{3}},\]\[2r\]

    Correct Answer: D

    Solution :

    \[scc:a=2r\,\,;\,\,bcc:\sqrt{3}a=4r\,\,;\,\,fcc:\sqrt{2}a=4r\]


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