A metal crystallizes in two cubic phases, face centred cubic (fcc) and body centred cubic (bcc) whose unit cell length are 3.5 and 3.0 Å respectively. Calculate the ratio of density of fcc and bcc.
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For fcc centred cubic cell n = 4, a = 3.5 Å
∴ ρfcc=4×MmNA×3.53 ........(i)
For bcc latticen = 2, a = 3.0 Å
From equations (i) and (ii)