1.

In face centred cubic unit cell, what is the volume occupied?

Answer»

`4/3pir^3`
`8/3pir^3`
`16/3pir^3`
`(64r^3)/(3sqrt3)`

Solution :The volume occupied by the face CENTRED cubic unit cell is `pi/3pir^3`
Packing fraction or volume occupied brgt `Z_(ett) XX volume of C- atom = `Z_(eff)xx(4/3pir^3)/a^3`
For FCC, `Z_(eff)=4=(4xx4/3pir^3)/a^3`(where,a=1)


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