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KVPY Sample Paper KVPY Stream-SX Model Paper-1

  • question_answer
    The edge lengths of the unit cells in terms of the radius of spheres constituting fee, bcc and simple cubic 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 :

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


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