Solid StateHard
Question
In FCC unit cell, what fraction of edge is not covered by atoms?
Options
A.0.134
B.0.293
C.0.26
D.0.32
Solution
Fraction of edge covered by atoms $= \frac{2r}{a} = \frac{2r}{4r/\sqrt{2}} = 0.707$
Hence, fraction of edge not covered = 0.293
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