A metal crystallises into a lattice containing a sequence of layers as ABC ABC ABC... . What percentage of voids are left in the lattice?
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a
72%
b
48%
c
26%
d
32%
answer is C.
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Detailed Solution
ABC ABC packing is cubic close-packing in which all atoms occupy 74% of the total space.P.E =4×43πr322 r3=0.74 ;Hence, 26% of voids are left in the lattice.