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The correct relationships between unit cell edge length ‘a’ and radius of sphere ‘r’ for face-centred and body- centred cubic structures respectively are -

1. 2 2 r = a and 3 r = 4a
2. r = 2 2 a and 4r = 3 a
3. r = 2 2 a and 3 r = 4a
4. 2 2 r = a and 4r = 3 a

Correct answer: 2 2 r = a and 4r = 3 a

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