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UPSEE Solved Model Paper 1
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© examsnet.com
Question : 68
Total: 150
The packing efficiency of the two dimensional unit cell show below is
39.27%
68.02%
74.05%
78.54%
Validate
Solution:
𝑃. 𝐸 =
Area
occupied
by
effective
atoms
Area
of
square
×
100
The relationship here is that the diagonal = 4r , or
2
a
2
=
16
r
2
; a =
2
√
2
r
=
2
×
π
r
2
(
2
√
2
r
)
2
×
100
=
2
π
r
2
8
r
2
×
100
=
π
4
×
100
= 78.54%
© examsnet.com
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