MGIMS WARDHA MGIMS WARDHA Solved Paper-2013

  • question_answer
    Copper has face centered cubic (fcc) lattice with interatomic spacing equals to\[2.54\text{ }\overset{o}{\mathop{\text{A}}}\,\]. The value of lattice constant for this lattice is

    A)  \[\text{3}\text{.59}\overset{o}{\mathop{\text{A}}}\,\]                               

    B)  \[2.54\overset{o}{\mathop{\text{A}}}\,\]  

    C)  \[1.27\overset{o}{\mathop{\text{A}}}\,\]                          

    D)  \[5.08\overset{o}{\mathop{\text{A}}}\,\]

    Correct Answer: A

    Solution :

                    The value of lattice constant \[a=\frac{4r}{\sqrt{2}}\] \[=2\sqrt{2}\times r\] \[=2\sqrt{2}\times 2.54/2\] \[=3.59A\]


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