1.

A metallic crystal crystallizes into lattice containing a sequence of layers AB,AB,AB. . .. . . . .. ...The percentage of free space in this lattice is

Answer»

0.74
0.26
0.32
0.48

Solution :It is FCC PACKING
Volume occupied`=(4(4)/(3)m^(3))/(a^(3)) [4r=sqrt(2)arArra=2sqrt(2)r]`
`=(4xx(4)/(3)m^(3))/((2sqrt(2)r)^(3))=(16)/(3)xx(1)/(16sqrt(2))pi=(pi)/(3sqrt(2))=(3.142)/(3xx1.414)=0.74`
Volume occupied is 74%, FREE space =26%


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