The correct relationship between unit cell edge length '$a$' and radius of sphere '$r$' for face-centred and body-centred cubic structures respectively are:
- A$r = 2 \sqrt{2} a$ and $\sqrt{3} r = 4 a$
- B$r = 2 \sqrt{2} a$ and $4 r = \sqrt{3} a$
- C$2 \sqrt{2} r = a$ and $4 r = \sqrt{3} a$
- D$2 \sqrt{2} r = a$ and $\sqrt{3} r = 4 a$
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DifficultKVPY 2010
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