A) \[\frac{422}{{{x}^{3}}}\]
B) \[\frac{205}{{{x}^{3}}}\]
C) \[\frac{211}{{{x}^{3}}}\]
D) \[\frac{105}{{{x}^{3}}}\]
Correct Answer: A
Solution :
\[d\,\,=\,\,\frac{Z\,\times \,M}{{{N}_{A}}\,\times \,{{a}^{3}}}\] For fee unit cell \[Z\,\,=\,\,4\] \[d\,\,=\,\,\,\frac{4\,\,\times \,\,63.55}{6.023\,\,\times \,\,{{10}^{23}}\,\,\times \,\,{{(X\times {{10}^{-8}})}^{3}}}~\] \[\therefore \,\,\,\,d\,\,\cong \,\,\,\frac{422}{{{x}^{3}}}~\]
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