What will be the distance between two nearest neighbour in primitive, fcc and bcc unit cell?

Question

What will be the distance between two nearest neighbour in primitive, fcc and bcc unit cell? (A) For bcc, d = 1.414 a (B) For bcc, d = 1.72 6 a (C) For primitive, d = a (D) For fcc, d = 0.707 a

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Correct answer is (c) For primitive, d = aCorrect answer is (d) For fcc, d = 0.707 a

Q. What will be the distance between two nearest neighbour in primitive, fcc and bcc unit cell?

For bcc, d = 1.414 a

For bcc, d = 1.72 6 a

For primitive, d = a

For fcc, d = 0.707 a

Correct answer is (c) For primitive, d = aCorrect answer is (d) For fcc, d = 0.707 a

Q. What will be the distance between two nearest neighbour in primitive, $f cc$ and $b cc$ unit cell?