A) \[\frac{4}{\sqrt{3}}r\]
B) \[\frac{4}{\sqrt{2}}r\]
C) \[2\,r\]
D) \[\frac{\sqrt{3}}{2}\,r\]
Correct Answer: B
Solution :
Key Idea: In face centred cubic unit cell atoms occupy 8 corners of cube and one atom is present at the centre of each face. For simple cubic unit cell edge length = 2r For body centred cubic unit cell edge length \[=\frac{4\,r}{\sqrt{3}}\] For face centred cubic unit cell edge length \[\frac{4}{\sqrt{2}}r\] where r = radius of atom
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