At about 1180K iron transforms into fcc structure from bcc structure which is also the structural form at room temperature.Assuming no change in density find the ratio of nearest*neighbour distance in fcc structure to that in bcc structure.*

2. Relevant equations

For fcc nearest neighbour distance is a/ 2^(1/2)

For bcc " """"""" """" [a × 3^(1/2)]/ 2

3. The attempt at a solution

I took the ratio of the above formula.I am getting 0.8 .But the given answer is 1.029.Clearly my method is wrong .Please help.