A) \[454\text{ }kg\text{ }{{m}^{-3}}\]
B) \[804\text{ }kg\text{ }{{m}^{-3}}\]
C) \[852\text{ }kg\text{ }{{m}^{-3}}\]
D) \[908k\,g{{m}^{-3}}\]
Correct Answer: D
Solution :
For bcc, \[d=\frac{\sqrt{3}}{2}a\] \[a=\frac{2d}{\sqrt{3}}=\frac{2\times 4.52}{1.732}\] \[=5.219{{A}^{o}}=522pm\] \[\rho =\frac{Z\times M}{{{a}^{2}}\times {{N}_{0}}\times {{10}^{-30}}}\] \[=\frac{2\times 39}{{{(522)}^{3}}\times 6.02\times {{10}^{23}}\times {{10}^{-30}}}\] \[=0.91\,g/c{{m}^{3}}=910\,kg{{m}^{-3}}\]
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