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Byju's Answer
Standard XI
Mathematics
Relation between Coefficient and Indices of X and Y
In an atomic ...
Question
In an atomic bcc, what fraction of edge (in percentage) is not covered by atoms?
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Solution
In body centre cubic unit cell atoms are present at corner + Body centre
Edge length = a
In bcc
√
3
a
=
4
r
⇒
r
=
√
3
4
×
a
So; edge not covered
=
a
−
2
r
=
a
−
2
×
√
3
4
×
a
=
a
(
1
−
√
3
2
)
Fraction of edge is not covered by
=
a
(
1
−
√
3
2
)
a
×
100
=
13.4
%
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