Solid State Question 177
Question: The ratio of close-packed atoms to tetrahedral holes in cubic close packing is
[Pb. PMT 1998]
Options:
A) 1 : 1
B) 1 : 2
C) 1 : 3
D) 2 : 1
Show Answer
Answer:
Correct Answer: B
Solution:
Every constituent has two tetrahedral voids.
In ccp lattice atoms $ =8\times \frac{1}{8}+6\times \frac{1}{2}=4 $ \ Tetrahedral void $ =4\times 2=8 $ ,
Thus ratio $ =4:8::1:2 $ .
BETA
