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A metal crystallizes into two cubic phas...

A metal crystallizes into two cubic phases, face-centred cubic and body-centred cubic, which have unit cell lengths `3.5` and `3.0 A`, respectively. Calculate the ration of densities of fcc and bcc.

A

3.12

B

2.04

C

1.26

D

0.72

Text Solution

Verified by Experts

The correct Answer is:
C
`d = (ZM)/(a^(3)N_(A)) (d_(1))/(d_(2)) = (4)/((3.5)^(3)) xx ((3)^(3))/(2) = 1.26`
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